Any comments are appreciated.

A lot of variables would change the time needed ... 

-- full sunshine on the wood, 60*, and a little wind blowing on it would definitely be a lot better than ... -- in the shade, cold, and a low to calm wind.  Trust your instincts, your gut should be able to help you decide when it "feels" dry enough.

The wood has already accepted moisture several times this winter, it is very prone to doing it again overnight, and all things considered, this time of year, I wouldn't advocate starting to put the walls back together early in the morning, whatever moisture does evaporate in the afternoons, there will likely be some condensation and a little reabsorption overnight. 

Morton won't want to start mid afternoon, but I'd feel better this time of year given the circumstances, if they could only work during the warmest, driest, part of the day, at least wait until a couple of hours after the dew or frost is gone, once it has dried down to an acceptble level to 'start' the repairs.