Main line hotels are making money filling a niche. You don't have to rent a nice place for a whole night at a long rate or seek out a flea bag cheapie hotel for your quicky afternoon delight.
The BBC reports the nicer hotels are now offering afternoon rates will all the amenities for the spur of the moment crowd.
Haven't heard of it yet here, so you might have to still use those places near Duff's house if you want to save. I'd feel a little cheap asking for hourly rates at the Hilton, so if good fortune happened, I'd opt for the night.