1

Now, if someone told me that the weather is very bad. I would like to ask about when it started to become bad and for how many days.

Is it okay to use "How long" like:

How long has it been bad?

Or

For how long has it been bad?

Also, can I say:

Since then has it been bad?

3

How long has it been bad?

is perfectly fine to ask. A native might say

How long has it been that bad?
How long has it been this bad?

Your other question

Since then has it been bad?

is incorrect, and should be

Since when has it been bad?

  • So I think "Since then" means "at that time" or "Starting from that time" and it cannot be used as a question word, right? – user2824371 Jul 5 '18 at 18:55
  • Not as a question, but as a statement, referring to some earlier time, it's fine to say "Since then it's been bad." . – Andrew Jul 6 '18 at 0:09

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