3 added 4 characters in body
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In the comments, @FumbleFingers highlighted some changes needed to your examples.

  • No: 1. How long {it's} going to take until {it'll} be ready?
  • ✔️ Yes: 1. How long is it going to take until it is ready?

Note that it's -- "it is" -- needs to be inverted to "is it", because it's a question (see more at this article).

  • No: 2. How much time remain / left until it'll be ready?
  • ✔️ Yes: 2. How much time is left until it is ready?
  • ✔️ Yes: 2. How much time remains until it is ready?

More suggestions

You could replace "it" with the food, lunch, or dinner.

  • ✔️ Yes: 3. How long before the food is ready?

  • ✔️ Yes: 4. When can we eat? To this they may say something like "in 15 minutes". This seems very informal to me.

To this they may say something like "in 15 minutes". This seems very informal to me.

  • ✔️ Yes: 5. When will the food be ready? Again, seems very very informal.

    ✔️ Yes: 5. When will the food be ready?

Again, seems very very informal.

  • ✔️ Yes: 6. I am starving. How much longer?

  • ✔️ Yes: 7. How long before we can eat?

  • 😕 Awkward: 8. How long before we can dine?

Eat is fine. Notice that the verb "dine" isn't used this way in conversational English.

In the comments, @FumbleFingers highlighted some changes needed to your examples.

  • No: 1. How long {it's} going to take until {it'll} be ready?
  • ✔️ Yes: 1. How long is it going to take until it is ready?

Note that it's -- "it is" -- needs to be inverted to "is it", because it's a question (see more at this article).

  • No: 2. How much time remain / left until it'll be ready?
  • ✔️ Yes: 2. How much time is left until it is ready?
  • ✔️ Yes: 2. How much time remains until it is ready?

More suggestions

You could replace "it" with the food, lunch, or dinner.

  • ✔️ Yes: 3. How long before the food is ready?

  • ✔️ Yes: 4. When can we eat? To this they may say something like "in 15 minutes". This seems very informal to me.

  • ✔️ Yes: 5. When will the food be ready? Again, seems very very informal.

  • ✔️ Yes: 6. I am starving. How much longer?

  • ✔️ Yes: 7. How long before we can eat?

  • 😕 Awkward: 8. How long before we can dine?

Eat is fine. Notice that the verb "dine" isn't used this way in conversational English.

In the comments, @FumbleFingers highlighted some changes needed to your examples.

  • No: 1. How long {it's} going to take until {it'll} be ready?
  • ✔️ Yes: 1. How long is it going to take until it is ready?

Note that it's -- "it is" -- needs to be inverted to "is it", because it's a question (see more at this article).

  • No: 2. How much time remain / left until it'll be ready?
  • ✔️ Yes: 2. How much time is left until it is ready?
  • ✔️ Yes: 2. How much time remains until it is ready?

More suggestions

You could replace "it" with the food, lunch, or dinner.

  • ✔️ Yes: 3. How long before the food is ready?

  • ✔️ Yes: 4. When can we eat?

To this they may say something like "in 15 minutes". This seems very informal to me.

  • ✔️ Yes: 5. When will the food be ready?

Again, seems very very informal.

  • ✔️ Yes: 6. I am starving. How much longer?

  • ✔️ Yes: 7. How long before we can eat?

  • 😕 Awkward: 8. How long before we can dine?

Eat is fine. Notice that the verb "dine" isn't used this way in conversational English.

2 Incorporate comments. Remove redundant items. Renumber. Reformat.
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Well, FumbleFingers already pointed outIn the necessarycomments, @FumbleFingers highlighted some changes needed to the original optionsyour examples.

  • No: 1. How long {it's} going to take until {it'll} be ready?
  • ✔️ Yes: 1. How long is it going to take until it is ready?

I am just goingNote that it's -- "it is" -- needs to write it outbe inverted to "is it", because it's a question (see more at this article).

  • No: 2. How much time remain / left until it'll be ready?
  • ✔️ Yes: 2. How much time is left until it is ready?
  • ✔️ Yes: 2. How much time remains until it is ready?

More suggestions

You could replace "it" with the food, lunch, or dinner.

  1. How long is it going to take until it is ready? You could replace "it" with the food, lunch, or dinner.

  2. How much time remains (or is left) until it is ready? This is your version.

  3. How long before the food is ready?
  4. When can we eat? To this they may say something like "in 15 minutes". This seems very informal to me.
  5. When will the food be ready? Again, seems very very informal.
  6. I am starving. How much longer?
  7. How long before we can dine?
  • ✔️ Yes: 3. How long before the food is ready?

  • ✔️ Yes: 4. When can we eat? To this they may say something like "in 15 minutes". This seems very informal to me.

  • ✔️ Yes: 5. When will the food be ready? Again, seems very very informal.

  • ✔️ Yes: 6. I am starving. How much longer?

  • ✔️ Yes: 7. How long before we can eat?

  • 😕 Awkward: 8. How long before we can dine?

Eat is fine. Notice that the verb "dine" isn't used this way in conversational English.

Well, FumbleFingers already pointed out the necessary changes to the original options.

I am just going to write it out.

  1. How long is it going to take until it is ready? You could replace "it" with the food, lunch, or dinner.

  2. How much time remains (or is left) until it is ready? This is your version.

  3. How long before the food is ready?
  4. When can we eat? To this they may say something like "in 15 minutes". This seems very informal to me.
  5. When will the food be ready? Again, seems very very informal.
  6. I am starving. How much longer?
  7. How long before we can dine?

In the comments, @FumbleFingers highlighted some changes needed to your examples.

  • No: 1. How long {it's} going to take until {it'll} be ready?
  • ✔️ Yes: 1. How long is it going to take until it is ready?

Note that it's -- "it is" -- needs to be inverted to "is it", because it's a question (see more at this article).

  • No: 2. How much time remain / left until it'll be ready?
  • ✔️ Yes: 2. How much time is left until it is ready?
  • ✔️ Yes: 2. How much time remains until it is ready?

More suggestions

You could replace "it" with the food, lunch, or dinner.

  • ✔️ Yes: 3. How long before the food is ready?

  • ✔️ Yes: 4. When can we eat? To this they may say something like "in 15 minutes". This seems very informal to me.

  • ✔️ Yes: 5. When will the food be ready? Again, seems very very informal.

  • ✔️ Yes: 6. I am starving. How much longer?

  • ✔️ Yes: 7. How long before we can eat?

  • 😕 Awkward: 8. How long before we can dine?

Eat is fine. Notice that the verb "dine" isn't used this way in conversational English.

1
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Well, FumbleFingers already pointed out the necessary changes to the original options.

I am just going to write it out.

  1. How long is it going to take until it is ready? You could replace "it" with the food, lunch, or dinner.

  2. How much time remains (or is left) until it is ready? This is your version.

  3. How long before the food is ready?
  4. When can we eat? To this they may say something like "in 15 minutes". This seems very informal to me.
  5. When will the food be ready? Again, seems very very informal.
  6. I am starving. How much longer?
  7. How long before we can dine?