In Kimi no Na Wa., how long does the comet fragment take to reach Itomori Town?
Personally I think the comet's fragment has gone through a full orbit around the Earth, because it is unlikely that it has diverted so much from the original comet trajectory (which is tangential to Earth) to fall almost perpendicularly, since the break was above Japan and the fragment also fell in Japan


So it is likely that more than an hour has passed between the break and the impact.

By the way, I'm not an aerospace engineer, maybe my reasoning does not make sense ^^