Next month I will have an 8 hour layover at IST, arriving SQ J (from SIN) and departing TK J (to VNO), separate tickets.
I don't particularly want to sit in the lounge for all this time, and would prefer to visit the lounge on arrival for a spot of breakfast and a freshen up, and then head out into the city for a bit of sightseeing, before returning to the airport for my flight.
Would this be straightforward, or even possible?