Jack Campbell is given a glimpse of an alternate life in The Family Man. It starts on Christmas day and ends sometime after that.
How many days did he live in the alternate reality?
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Sign up to join this communityThis was discussed in a thread over at the IMDB. The responders intelligently noticed that a store announcement just before the "glimpse" has finished advertises Valentine's Day specials.
When he returns from the glimpse, it is Christmas Day. Therefore, it can be surmised that his glimpse lasted approximately six weeks (1 - 2 months).