You can do it based on how many times you got it right, but I think a more sensible approach is to do it based on how many times you've go it wrong. Anki does this through its concept of leeches and the way that it's explained makes alot of sense to me. So much so that I've cut my leech threshold in half to 4. If my brain is having a hard time remembering something, it's probably not the best usage of my time to just mindlessly keep drilling.

https://docs.ankiweb.net/leeches.html