This is at least a four day journey, right?
Edit: Pretty much two full days at normal pace, I think.
Correct; on foot/with a cart, it takes two days on Cecily's Road to travel from Hochoch to Orlane. Two days there + two days back = at least four days gone.
I just realized — thanks to your superb summary, spaceseeker19 — that Myrtha has been holding on to Bertram’s documents since she took them. I would assume that she would have read through them and handed them over to Olpert, at least during the two days of training. Assuming it’s too late to retcon those actions into the narrative, Myrtha will be studying these documents at night, before going to sleep or keeping watch…