They can go
alot. Its just generally better to go less and know to get good litters then have him cover alot and get small litters or does not take.
I have done three does in a day. Doe one in the mornin, doe two at noon-ish, doe three in the evenin. Next day breed doe three in mornin, doe two noon-ish, doe one evening. And all three took and had average litters.
It depends on the stamina of the individual buck mostly.
And the young buck.. it seems in my
experience they take longer to "get it" than people assume. My bucks were 9 months and 11 months before they understood what to do each time a doe is put in their pen/cage.