So, I think there's something really important to note here. When talking about setting a bevel on a BBW or coticule, no one is talking about doing any major work. Essentially, if you have a razor with a rounded bevel or just barely visible edge damage, that'll not take too long on either.
Basically, my rule of thumb is if it takes more than 5 minutes to set the bevel (or if I think it will), start on something else (low grit synthetic). From the bevel setting, it literally takes me less than 10 minutes on one that I know really well. No more than 15 minutes. But, I'm doing hundreds of laps in that time. So, for a new guy, I honestly cannot guess how long it might take. It could be 45 minutes or more. I really just don't know.
Basically, my point is the amount of time is relative to the skill/speed of the honer and the work to be done.