Worst case situation is going to be you ending up reserving a room in the airside hotel (which is actually quite decent, albeit a little expensive) and using the F lounge for a few more meals than expected (and perhaps racking up some high scores on the Playstations/Xboxes in there!) - you aren't going to be put on plane back home if you have onward travel, just restricted to the (rather vast) airside area. Movement back from immigration to the airside area is extremely easy - but book a refundable rate at the Hyatt!