Here's my guess:

If for some reason your system clock was set very incorrectly, it might take that long to adjust. One way this might happen is if the watch battery has died and when your computer boots, it thinks the date is midnight 1 Jan 1970.

The tor client also needs to download from the Directory Authorities information about what nodes are available for passing tor traffic. This usually takes several minutes (limited I assume by the fact that the DA's are busy, not by your internet connection speed).

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