A little over 50 snakes of various species, I average 1-3 hrs a day every other day for feeding, cleaning, various prep work.
I do not include feeder thawing time in this since I do other things around the house or game while they are thawing.
I'm a hobby breeder, every other year or so I pair things up, if I was breeding multiple pairs each year I'm sure there would be quite a bit more time spent in caring as well as taking photos and advertising for sale.