Future simple vs future continuous

Vlada Larionova I will do it for 2 daysOrI will be doing it for 2 daysWhat is correct?Thank you

Both are correct.

Vlada Larionova I will do it for 2 daysOrI will be doing it for 2 daysWhat is correct?Thank you

Both are correct if you put a period at the end.

Vlada LarionovaI will do it

There is a deliberate intention in doing it.

Vlada LarionovaI will be doing it

It's a mere statement of a future fact without the emphasis on deliberate future action.

Vlada Larionova I will do it for 2 days Or I will be doing it for 2 days What is correct? Thank you

Both are correct, but which is appropriate depends on the context and on your intended meaning.

I think of something like these:

I've been asked to help at the state fair this year. I don't really want to do it. I say, "I'll do it for two