which one is correct and why?
Suppose that we are talking about a kind of dish.
"It's ready IN under 30 minutes."
"It's ready under 30 minutes."

Question

which one is correct and why?
Suppose that we are talking about a kind of dish. 
"It's ready IN under 30 minutes."
"It's ready under 30 minutes."

Answer

Thanks alot. 👍

Answer

English native here. The former is correct: It's ready in under 30 minutes. The other way sounds weird. I'd understand it, but it doesn't sound right. I can't explain the exact grammatical reason, but things are often done (though not always) IN an amount of time, so I assume it's following that convention.

"I'll be there IN 2 hours"
"Meet me here IN ten years and we'll compare notes" (You could also say "meet me here a decade from now" where there's an implied but unspoken IN - "meet me here IN a decade from now").
"IN a thousand years, we'll all be dust."

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