Which preposition should be used in this sentence:
"She has 5 sessions scheduled for/in the next 7 days."
For context: I want to say that she has booked this number of sessions with the instructor and will take them during the next 7 days. Which preposition should I use in the sentence? I usually use "for" in such context, but also found examples with "in" that seem to have the same meaning...Or can I use both prepositions without no difference in the meaning?