They do know the number of nights.
We are only at 28 stays but the vast majority of them have been for 6 nights so we are well over 100 nights.Nothing when we passed 100 nights.But having stayed that many and for several nights at a time our reward is a lot of the staff know us and the service is just wonderful.
Two instances from our last stay.Mrsdrron once joked to the fellow who brought our bags to the room that we were on our honeymoon.He was the one delivering them this visit.So on entering the room he says -Welcome back for your 28th honeymoon.
The woman greeting you at Rossinis for breakfast on seeing my wife-You have changed your hairstyle-the last stay was 3 months previously.
We do really look at the SGS as our home away from home.