No worries, I have no need to ride hard all the time. I am just a 40-year-old beginner myself, though I do mountain bike a bit. Four hours is more than enough even at a very slow pace. You would probably need 2-3. Do let me know if you want me to show you around since the Ken Caryl area is very scenic and I enjoy slow rides too. I have actually never ridden Lookout but by the time you get here, I will have. Otherwise, run solo and enjoy the view. I have been to almost every state and a lot of countries and I am still in awe of Colorado. Just let me know if you need a tour/ride guide.

Renting- not sure but will look into it.