Best vaporizer for long slow sessions?

I like to fine tune my high and looking for something that I can slowly puff on over the course of an hour or two while playing videos games or watching a movie. One I don’t have to monitor but can just hit it every 10 or 20 min lightly. It doesn’t have to be portable at all. If I wanna get baked quickly I have a terpcicle that gets me there.