If you over stay your visa period, even by a few hours penalties are levied on a sliding scale.
An over stay of between 1 and 15 days - There is no restriction on re-entering Turkey but s/he will have to pay the appropriate visa fines and will need to obtain his/her new visa from a Turkish Consulate. In the case of people staying in Fethiye the nearest would be on the Greek Island of Rhodes. However, recent evidence shows most people are issued with their new visa by the imiigration police after paying a hefty fine.
Taken from Fethiye Times