A lot has been made of the "what if" this happened more than an hour out. One can speculate until the cows come home, but if this was due to liquids escaping from the galley, one would anticipate the bulk of liquid disposal from the galley would be either after each meal service (which could be >1 hr out), and with fair quantity of disposal (hot water, ice etc, what else?) during preparations for landing (which is usually going to be <1 hr out).