By taking a nap, taking a shower, having a quick hand-shandy, or whatever, you can make as much mess in three hours as in twenty-four. Unless it's a certain special kind of hotel, this will have to be cleaned up before the next guest arrives. In a typical hotel operation there are too many individual steps involved in providing hospitality to a guest to make it economical to provide the level of staff and resources needed to have a three-hour turnaround. The increased activity and constant noise would destroy whatever ambience the hotel had strived to create.

A better way to go would be the "Capsule Hotel" model found in Japan. A modified form of this is being developed in London, with rooms just big enough to stand up and lie down in. This is the fast food version of a hotel, and the rooms can be cleaned and turned over very quickly and efficiently.

Another obvious problem would be the use of the facility for illegal sexual purposes. This happens of course with normal hotels but short stay hotels would probably intensify the problem.

I agree that room sizes will be probably smaller, and maybe have less facilities than what current rooms have. However, other features can be added which will recover the cost e.g. paid music or video feed.

If these hotels are offered inside the airports, I do not illegal sex would be a big problem there.

actually.... some hotels in singapore have in total above 1000 rooms available at about 13USD per hour... stiff competition u got there...