One big factor is how hard you go.
I raced with Kuhmo's at the Autobahn - 3.5 miles , lots of turns. but it was my first time out. I started out at thirty and it was fine at first but as I started going faster, the pressure built up. It started to get really squirly so I checked the pressure, it was over 40#s. Next time I plan to start at 25#s and check them often.