4 hours, as TE says, sounds about right. How to book? Go to coach office - Kamil Koc, Pamukkale, other - a day or so before. Cost? Surprisingly little - surprising, that is, if it is your first time in Turkey. Air conditioned coaches, complimentary water and lemon cologne, and a pleasant route - especially when descending from the Mugla plateau with what must be one of the best views in all of Turkey. Sit back and enjoy it.