I read on the forums that less is sometimes used with plural nouns,
especially those expressing distances or periods of time. Yet,
technically, fewer is to be used in such cases so in the end, what's
the correct form (by correct I mean both in terms of grammar and "how a
native speaker would say it", if you see what I mean).
"We can perform this task in less than 3 weeks"
"We can perform this task in fewer than 3 weeks"
Someone told me that the problem could be eliminated through the use of "under" i.e.
"We can perform this task in under 3 weeks".
So what's the best way of putting it?