Turkish Airlines Miles&Smiles - LHR check in

Hi
I can't see this in the forum. Sorry if it's been asked.
I am going to be at LHR at 19:00 tomorrow but on a 22:30 flight (my domestic flight doesn't connect). Is it true that I can't check in until 2 hours before departure? That's a long time to wait when I have a nice lounge I could be using!

I-ve not yet taken this overnight flight to Istanbul, but I have taken the flight that goes around 11.30 am a number of times. In my experience check-in has usually started 3 hours before. The SAS London Lounge is a nice one, I agree.

They'll probably check you in.