So if my slang translator is working properly, you're asking whether 11:00 AM is a reasonable checkout time and whether anyone has ever been charged a later checkout fee if they departed their room after 11:00 AM but before Noon (as you, I think, consider Noon reasonable?)?

11:00 AM is pretty typical but I've seen as early as 10:00 AM many times as well as Noon. I don't understand why you would consider anything in that range as unreasonable. You're generally staying overnight so morning is when one would expect to be done with a room. The property also needs to have time to get rooms ready for the next guests' check-in that afternoon. If everyone stayed into the afternoon for checkout, there would be angry customers whose rooms aren't ready yet to check-in.

I'm sure some people have been charged, somewhere...especially if they stayed way past checkout time and it was holding up housekeeping from doing their work. Unlikely that leaving 10 minutes late is going to be an issue. I suppose at very large hotels one could theoretically get away with staying until the point where it was the last room that housekeeping has on their list for that day, which could be awhile at properties with lots of rooms (not that I'm advocating to do so). Smaller hotels would obviously notice sooner.

Of course you can always ask for a late checkout if available. The extra charge may not be that much and in some cases, in my experience, may be at no charge if it's not a long time. Some higher elite statuses offer it as a complimentary benefit subject to availability.