I think if you are a depositing player.. that that rule should not exist, the free rooms should be able to use whenever, whatever and how ever long, i can understand a non depositing player constantly in the free rooms, thats like loitering or panning for money without asking lol..
and yes,if they fear bonus abuse.. why offer free and the ability to cash out on a free, and also advertise it, but kick you out if you stay too long calling you a professional?
i've kicked it the bingos rooms for hours enjoying the company, but i never knew they had it in the back of their mind, timing your stay and play!