Considering, that between 1600 h and 1700 h usually about 30-35 planes are landing at IST, I believe, that debarking and arriving in the lounge will take at least 20 up to 30 mins depending, where the plane will drop off the pax.

Then again, considering that and from the lounge to the connecting flight will take another 20-30 mins depending which gate you will get (hopefully not the 700 ones.. ..