Drag Slick Tubes.....whats the life spand???

Flyfish, with not running tubes does your slicks need adjusted for pressure each run, or do they stay pumped up to where you put them? What slick do you run?
Rod

I used to run Hoosier quick time pros, like others have said, the dish soap trick makes them seal great. My last set I needed to add about a pound of air to one of the tires every 2-3 weeks...that's it. When I put my first set of Hoosier QTP's on the car I ran tubes, and it worked fine. When I replaced the tires I tried it without tubes and the car hooked better...so I ran without tubes ever since. I just recently (a couple months ago) switched over to a drag radial, but I ran my car tubeless for over 10 years.