I like the idea of "Buffer time your customers can't book". I like to give myself 15 minutes between appointments to go to the bathroom, check email, jot down notes from the previous meeting, drive t...
Why create an event for the buffer at all? Might make sense for a 2h demo (preparation), but if you offer many e.g. 15 min slots for questions/support, all the buffer events just make your calendar look messy.