1.How long will it last?

2.How long would it last?

One is present and the other is past?

In what context I can use them?

1 Answer 1


"Would" is used in conditional clauses. The second sentence implies that the speaker is either going to follow with "If...." or this "If" statement can be understood from the context:

Let's suppose the moon is made of cheese; how long would it last?

The first statement simply asks for a prediction of the future, with no particular condition being given.

Oil is running out; how long will it last?

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