Correct me but I'm wrong, but this is basically letting you "farm" for infinite perk points, and can be done over and over again with ONE skill only (I'm thinking about "loop leveling" Alteration using Telekinesis until I have enough perk points for whatever).
The only catch is that particular skill that you're looping will decrease its effectiveness... At least for 15 minutes as I grind my way back to 100.
If this is true, then I don't think there are any limits to how much skills Beth could put in.