A "maximum" of three days would not be the correct way to word it, as it implies that you could "take away" days. Minimum is the correct verbiage, as it suggests that you could allot more days under certain circumstances.
Overall, it looks good!
Minimum to me means that you need to be riding at least 3x a week, but feel free to do more.
I guess it's about clarifying what you are communicating.