It isn't 10 days per move. It's an average of 36 hours per move, with 10 days "grace". (Plus, as someone pointed out 20-30 days of vacation per year. Each time you run out of time in ANY of your games, if you have a vacation day left, 24 hours gets added to your clock in ALL of your active games).
And, no, you can't choose anything else. That is the only time control here.
"Each time you run out of time in ANY of your games, if you have a vacation day left, 24 hours gets added to your clock in ALL of your active games)."
That's how it used to work for me. But in my "Unexplained Timeouts" thread I explained I'm losing games when the clock hits zero even though I have vacation days left. It must be only me because no one else has mentioned it.