A Salda day starts with the hour you leave the hotel. You say how long you want by the water. The driver waits that long and brings you back to the same door in the evening. A public connection spends most of this distance on changes.
The road and a stop
From Pamukkale to the shore is roughly one and a half to two hours if you do not linger. In hot months a short water stop is written into the plan. Four to eight people fit a 9+1 vehicle. A larger day is easier in a 13+1 or 16+1 Sprinter.
If the return goes straight to Çardak or back to Karahayıt, say so in the first message. The fare, including any extra stop, is written before the car leaves.