Overall the Dremora skulls are fun and the 20 hours cooldown (the 4 hours grace period helps) isn't bad. The problem is that they are all on separate timers so I have to remember what order and roughly what time I did 7 different things the previous day. I've had at least one occasion that I apparently didn't do them in the right order. I went through a dungeon and didn't get one so I had to do it all over again. Maybe start the time from the first skull received? Thank you.