We do this trip regularly, to visit the out-laws in Antalya. Last took it last June (next time next Friday!) when frequency was about hourly for most of the day. It takes between 4.5 and 5 hours, but a spectacular route along the coast and up through the mountains, with a couple of rest stops. Last time I did it, they were showing Bad Santa as we arrived in Demre, near the village of Noel Baba (where St Nicholas/Santa Claus lived)! Single ticket cost was about 14-15 YTL last year, so just £6-7.