Correct me if I wrong
I was under the impression that there is no legal limit of blood/alcohol for flying an aircraft - i.e. the limit is in fact zero.
The 8 hour bottle to throttle only being a rule which assumes to get to 0.08 - that is, if you get to 0.08 it takes out hours to get down to zero as the body metabolises alcohol at the rate of 0.01 per hour. If you really have a big night you might still be over 0.08 when you open up the taps.