Mondays Wednesdays and Fridays except when they fall on a bank holiday then ya get the day/s off. If ya got a buk with ya car it'll tell ya in there, if no book ask the bloke hoo made the car or go to a tyre dealers and get to check 'em but it'll cost ya. You actually got a licence?
I LOOK at my tires every time I get in to drive, but actually check the air pressure with a gauge about once a month. This is about the same time I do a complete under-the-hood service check and top off all the fluids as necessary. Of course, I only drive this car about 200 miles a month.
Keep an eye on your tires. They are expensive and take a beating. You should listen to your tires while you are driving. Notice the normal vibration on the same roads you use every day. After you accidentally chew into a curb or hit a pothole, pay attention to these things. And when you stop, get down and look at the sidewalls for damage or bulge.