Yeah, it's about 5 1/2 hours from me. According to Google Maps, it's right at 7 hours from DIA by car. By Greyhound in the middle of winter... pppffffff
I would NOT recommend on taking a bus from DIA to Telluride. That sounds like the start of a bad movie. Get a shuttle service or rent an SUV or something. Honestly, if you have a pretty good sized group, renting a large SUV may be your best bet. FUCK taking a bus.