It depends on the day but not such a high percentage usually. Our design phases don’t last as long (software only).

Virtual meeting fatigue is real because there aren’t as many natural breaks. It is important to make sure that people know they can excuse themselves for water/food/bio breaks.

I’ve also found that virtual whiteboarding is slower for me as I’m used to picking up a dry erase marker. It takes time to adjust to the different work stream but a huge benefit is the quality of the end product (no sloppy hand writing, easy to modify).

I don’t have any direct advice geared towards your situation as our white boarding and planning phases are quite different in my industry.