How soon is too soon to take a serious trip/vacation with someone you just started dating?

How soon is too soon to take a serious trip/vacation with someone you just started dating?

Like a week into dating them, if they asked you to fly to like Brazil with them for the week, or go on a mountain adventure in Montana, are you going? Would it factor in if they offered to pay for the trip in you saying yes/no, or not?

How soon is too soon to take a serious trip/vacation with someone you just started dating?
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