riding a bus for 90 miles is completely different then riding a bike for 23 miles.

also! i forgot to mention, for a 23 mile ride, you should learn how to change a flat too. what kind of bike do you have? if you have a department store bike, it might last for the first 3 or 4 round trips (or if you're lucky, it'll last you forever), so you'll need a good bike too cuz you dont want it breaking down on you. plus the books.. do you carry a lot of books? depending on the geometry of your bike and your carry load, if you keep it up, it might lead to back problems later on...