Maybe even less than 24 hours, since I tried to clarify the amount of the bank draft needed (I think there's a typo--too little) right after I received the email and have heard nothing back yet.
Frankly, I can't make heads or tails out of their form of purchase agreement--since it doesn't clearly indicate how the rebates are being applied (you have to independently know they come off the total purchase price + tax before trade-in)--but, for your peace of mind, your car was exactly $2k more than mine (sports wheels?), and your trade-in less. So, you paid $2k more for the car, and ~$5k more in taxes (which makes sense, because you got a bigger bump into the luxury tax bracket and I only paid tax (13%) on the net difference between the purchase price and my trade-in value). Your total credits is ~$7k more than mine, so that looks right. But, again, it's hard to reconcile the numbers.
Edited to add: I looked more closely at the email I received tonight and it sets out more clearly than the MVPA is. In the email, they show me as having made a $13,200 "downpayment", which is a better way to characterize it than in the MVPA (although weird to show "$0 due at signing" vs. "payment due", but it's better than how "downpayment" is used in the MVPA as referring to the amount owing! Anyway, in the email, downpayment shows as follows:
• $13,200 total downpayment - $3200 deposit - $5000 CEV rebate - $5000 iZEV rebate = $0 due at signing
