* Should I finish all this work in an hour?

What is the meaning of 'in'?
Does it mean 'after' or 'within'?

within

Thank you for using the Jiskha Homework Help Forum. Actually, we need to know what part of speech "in" is! Since it did not have a hyphen, I'm assuming it is not a previx:

as a preposition, in = into

as an adverb = to or toward the inside; within

as an adjective = inside, incoming

as a noun = influence, pull

Sra

P.S. See how important the context, or exactly how the word is used, is.

The word "in" can have different meanings depending on the context. In the phrase "in an hour," "in" means "within" or "before the completion of" the specified time period. It implies that you have one hour of time available to complete the work. However, whether you can finish all the work within that hour depends on the amount of work you have and how quickly you can complete it. To answer your question, you would need to assess the workload and your own abilities to determine if finishing the work in one hour is feasible.