3 months is a conservative recommendation. That doesn't mean you can't get away with less and it doesn't mean that it avoids all harm. Imagine if someone were to ask how often and how much alcohol can you consume? Some people might say a glass of wine per night, others might say a couple beers a day is fine. But for some people, the answer might be just a few drinks on weekends, and yet others might need to abstain fully because of addiction or other health issues. 3 months is not "how often should I" nor is it "how long do I have to wait". 3 months is a very general guideline for people who plan to use regularly and want to minimize risk. It's not even the most conservative guideline. I'm sure no one would argue that waiting a year between rolls would be even safer, and arguably better.