It is utterly impossible to finish the work within a month.

Source: Tatoeba

Within days, German forces fanned out across Poland.

Source: Tatoeba

We'll fly there in 50 minutes.

Source: Tatoeba

It can be done in a day.

Source: Tatoeba

She will be back within a week.

Source: Tatoeba

I will answer within three days.

Source: Tatoeba

Ten to one it'll clear up in an hour or so.

Source: Tatoeba