I don't think they ever get much action to "grind" them imo, at least not during the hours in the evening I have ever been on
888 looking to play a few .... have sometimes waited 10 - 20 min and just unreging because its only half full.
I guess like many places though they probably get their most traffic around 2pm ET or so in the afternoon maybe since that is the start of the evening for folks across the pond.