We have this little track where I live: it takes about 40s to go round it but it is kind of fun because you really can press your car and really concentrate on doing a corner perfect since it is just 38 seconds until you are back at the corner again.

But on the other hand I really enjoy the Nordschleife, where you might have to wait 10 minutes to get back to the corner you just failed, forgotten what you intended to do and you finally fail at the same corner again.