The ability to restrict a customer's attendance per day is not supported in Mariana Tek at this time.
If you want to see this feature in the future, please submit the idea on our Product Roadmap.
Some studios have found that creating a “30 Classes/Month” limited membership in place of an unlimited membership can help reduce customers from attending multiple classes per day. In theory, customers will book once per day over the month.
You can limit the number of pending reservations a customer can make per day (although it will not prevent them from taking two classes/day).