Please let me answer this in a round about way.
The most important principle in yoga practice is to enjoy it and key to this is to pick the intensity you want to perform at (and find a class where you have the latitude to do this). If after every session you feel energised, clear headed and refreshed then you have achieved a form of mastery in yoga.
Naturally, if you feel like this you will want to feel like this again so you will visit your yoga mat more frequently. As you practice like this eventually all the ‘maidens of the Hatha yoga system’ ie. flexibility, strength, artistry and proficiency will come of their own accord BUT your first priority must be to savour and enjoy what you are doing ( so don’t over do it and don’t under do it, do it just right ie The Goldiloks Priciple !! ).