Sleuth - my understanding of the new visas are that from the date you arrive in Turkey they count back 180 days and if you have been in the country for 90 days during that period you are not allowed to enter. Also when you leave if you exceed the 90 days in the last 180 you get fined. I realise you haven't given the actual travel dates and you may be ok but it is worth checking. My understanding may be wrong and if so perhaps someone can enlighten as to the correct way to work it out.