If you want to inform someone in advance to do something early enough so the person won't be in trouble later, do you say on time or in time? It's not a specified time, like order it today between 12 and 2, it's more of a better do it now than later suggestion?

What's right here?


On time = at the planned time; neither late nor early: In time = with enough time to spare; before the last moment: In time is appropriate in your case.

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