Maximum 3 x a day since it does feed you some jing to that area and we wouldn’t want to overload or overdo the jing portion cause it can end up making you feel groggy and not so great.
That being said if you can handle a few more then do so but it’s what might work for you the best if you feel like your not getting relief from the one use right off the bat. What I used to do is do 2x right away and then later in the afternoon I’d do 2 again. But again that’s me and everyone is different so try it out and see what works.