Not 10 days, 9 days. If you rent on a Monday, for example, the movie will be due back by noon the next Tuesday.
Also, the coupon will NEVER work unless it is scanned after the DVD/movie. If this was not the case, the coupon would be capable of just subtracting $4.30 from your balance.
...there have been coupons that do this, though. Not these. These coupons SUCK, because everyone tries to use them, but, for example, the particular coupon YOU are trying to use was already used in Chicago back in June.
You can tell I work there, can't you?