Comment: Eleven minutes.  

Eleven minutes from: 
1.  her hailing a cab, 
2.  her getting in the cab, 
3.  her getting her money out of her wallet, 
4.  her saying 'hey, let's have sex' to the driver, 
5.  the cabby driving to a spot away from the direct route to her place, 
6.  the cabby parking the cab, 
7.  either her drunkenly removing her own panties or 
7.  him doing it on her direction [neither of which would be an easy task], 

to: 
8.  the police finding the cab with her passed out.

The acquittal depended on her passing out right at the very end of that 11-minute string of events.  Because if it happened at any time after her consent (#4), consent vanishes, and he's guilty.

Sure, it's possible it happened at minute 10, but is that a reasonable doubt?  Tough one.