I've used the Cabanas five times - each time for around two hours, apart from a 4-hour stay on the first week that the new lounge was opened.

Never been asked how long I'll use the Cabanas for, nor have I been interrupted while using it.

I think they should impose a time limit (say 3 hours or 4 hours) on using the Cabanas - but the 2 hours that Cathay Boy was using the Cabanas isn't really that long and I don't think the staff should have knocked on the door.