Could you spend a mill in a day ?

A business of some sort. Or start a charity.
Any home or vehicles I buy costing that much will cost more in taxes than I could afford to pay. And I don't need much besides a home and vehicle.

If it had to be something frivolous, then I think I'd buy a mil worth of lottery tickets. I never play the lottery, but in this case, I'm sure I'd have something to show for it at the end.