☆.A.
My son regulates his own video game time.
He's like a snake in the regard that he might play a lot O. day (2 hours) and then nothing for a few days.
We have no hard & fast "rules" other than when it's time for a shower, bed, dinner, etc. we expect "save and quit" to happen immediately.
He's got plenty of other activities and interests, so this isn't too much of an issue. He probably plays more in the winter/cold seasons.
And "gaming", like any other activity, comes after homework. That goes without saying.