Vague title, I realize, but I don't want to spoil any passersby. Here's my question, spoilered to keep people browsing /questions from seeing it:
How long was it from the first time that Taki and Mitsuha swapped until the last time (the day before the comet struck)? Relatedly, how long was it from when they realized they were swapping until the last time they swapped?
The sense I got is that it had to be a fairly long time (some number of months, perhaps), based on details like how they had pinned down that the swaps occur 2-3 times a week, and how each of them had gotten quite good at fitting into the other's life.
However, during the first scene that is set in Mitsuha's present with her in her own body, the TV news indicates that the comet is due to approach perigee within a month, and at this point, they hadn't yet figured out that they were swapping, which suggests to me that at best they could've had a few weeks where they were aware of the swapping phenomenon. (Granted, the swapping could've been going on for considerably longer with both of them still believing the swaps to just be vivid dreams.)
So the timelines seem a bit wonky to me. Can we pin down the duration of the "first" part of the movie more accurately?
I suspect that we should be able to get relatively tight bounds at least on how long they were aware of the swapping by examining the details of the diary entries Mitsuha was keeping on Taki's phone. (Or maybe this info could be found in the novelization?)