Thanks for replying! :)
There are no watches on this adventure, because the distances are short. There is a sentence indicating not to use the wilderness event table and use the random encounter table provided instead, but no indication on when to use it. We played last night, I chose to roll every time the players were travelling (only 1 of the 6 encounters is combat, the rest is other peaceful travelers on the roads), and it was fine, maybe that was the original intention.