We hardly had any rest stops, except the 10 min lunch break, we were hiking from morning 9AM to 3.30-45PM. I can add another 20-30 delay the team had to tolerate due to my cramps, many thanked me later that they got a chance to slow down since I was already pretty slow.
So either we should start early and manage the pace or don't go on very difficult hikes this one when the day light is short. I have a EB Serrano jacket with 60gms of Primaloft insulation but to be honest I'm sure I wouldn't have had a chance to wear it even for 20 mins.
Like one of the above post, I can understand my physical capacity, while I'm not a super human when I hiked Mt.Defiance ~5000ft elevation gain in peak summer, I did extremely well and managed to help my slow team members.
My question to you is, when your breaks are less than 2-3 minutes when do you get a chance to put on the jacket and remove it later.