Tramadol has a half life of 6 hours and is generally out of your system after a day/ day and a half or so. Whilst you may think you’re not going to go above 150mg you will eventually develop a tolerance to it the longer you take it. If you really want to just have it recreationally I’d stick to once a month.
Tramadol also acts like a SSRI that’s why it makes you feel happier as well as pain free. It’s an absolute bitch to withdraw from when you become physically dependant on it. If this is a prescription from your dr, I’d imagine he’s eventually going to cut you off because realistically you should be healing and pain free. If you haven’t stopped taking these recreationally by then that withdrawal is going to severely suck. I’ve come off a lot of medication, tramadol is up there as one of the worst, you don’t want to get to that stage with it.