I know most "well-informed" sites catered towards various domesticated pets will give you an amount that each species should be given to eat in a 24 hour period. But the general consensus is, I think, to feed an amount that they will consume within a 24 hour period, but not more than that.
Really, it varies from person to person. Some people aren't comfortable with their pet not constantly having food available, and others are entirely comfortable with giving only a limited amount.
Honestly, how much you feed him, is entirely up to you. Is he doing well on what you're feeding him? Good weight? Healthy and happy to the naked eye? Then I really wouldn't worry.
The food put down I think correlates with not only the owner, but their pet, as well. For instance, my cat will eat when she's bored, and depressed, so her food is taken away before we go to bed and therefore not around to give her attention. While my rabbit, on the other hand, only eats her pellets if all her roughage material is gone.
You know your hedgehog best. You have a one-on-one relationship with him, that no one here, not even other hedgehog owners can best. If he's doing well on the schedule you have set up, I'd say stick with it.