as long as 134a is staying cheap, and as long as your a/c will hold a charge, i'd keep recharging it with 134a until it just leaks too bad. you can get one of those 134a cans with the reusable hose and gauge for like 20 bucks and get a can of 134a for just a few bucks. i'd just keep topping it off until it's just either no longer economical for you to do so or until your compressor just says eh-eh, i'm done. unless your compressor has done so already, which may be the case. i've got some leaks too, and my mechanic said that the compressor is leaking also, but his advice is what i typed above. keep topping it off until it's just no good or until you get a good case of the ass and just wanna get it changed out. that's the game i play during the summer. just my 2 cents.