Does the money go poof if you spend it? For example, say I buy some jewelry with half of the million dollars. Then, the time limit passes. Does just the half a million I still have on hand disappear or does the cash I spent vanish as well?
If the cash I spend vanishes, then I might be opening myself up to fraud charges after the hour is up. Going back to the jewelry situation. I buy half a million in jewelry and hand over the last of the cash just as the time limit ends. If the money in the store clerk's hands suddenly vanishes, they're going to demand their merchandise back. If I'm already walking out the door when it goes poof, they'll call the police on me.
Of course, if the money that I spend doesn't vanish after the time limit expires, then that's a different story.