3-6 hours is fine. That is plenty of time for your players to recover, especially if you've got a full squad. Many managers would love to have that time difference.
I have suffer many times the gap less than 10mins. Really bad schedule and nonsense
I have suffer many times the gap less than 10mins. Really bad schedule and nonsense
I'd make a case of 2-3 hours being worse than 10 mins, you get no bonuses for the time between and you have to hang around and wait for your next game to start so you're at least able to give them a possession bonus!