It really depends on the tire how many miles you can go. My bike came with soft Michelin tires and those only lasted 1,100 miles. My previous bike had Gator Skins (tough training/puncture resistant tires) and I got over 2,500 miles on them. I inspect my tires before long rides or about once a week.
Amanda
2011 Specialized Epic Comp 29er | Specialized Phenom | "Marie Laveau"
2007 Cannondale Synapse Carbon Road | Selle Italia Lady Gel Flow | "Miranda"
You don't have to be great to get started, but you do have to get started to be great. -Lee J. Colan