We did this trip last year, it was planned to see the most in a "non-rush" way. We travelled by car around the coast from Calis, doing about 200 - 250 miles per day during daylight. We found good accomodation along the way, this was part of the "adventure". We got around to Mersin, a large city, turning due North to Cappadocia. I would suggest no less than three days there, you could do a week or more.
Our return was via Konya, staying further on at Isparta lake. As with any trip, you can vary it to suit, ours took a week.
A word to the wise, do ensure you fill up often, there were very few garages on the long run back.
A second piece of advice, do use the hotel loo before you start off; that "adventure" is a whole story in it's own right.