"In a period" I haven't been there at any [point in] time during that period. "For a period" I have been absent from that place throughout the entire period. They both amount to the same thing, but the focus is different.
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Anonymouswhat is the difference of in "period of time" and for "period of time". example: I haven't been here for a year. I havent been here in a year.This gets more complicated as you examine the behavior of these prepositions in different tenses and with negation. However, the general idea is that "in" has to do with the beginning of a time period, that i