My immediate thought was: if you drink this and you keep it down, you're going to die. So I found some calculators:
1.75 liters = ~59 ounces. Let's call it what, 80 proof? According to
this calculator , that's going to give a 200 lb guy a BAC of .88. That's without including the drinks you've already had.
According to Wiki, you're in easy death range. But how long will it take for you to actually expire? I couldn't find a quick answer, but I'm going to hazard 3-4 hours, because that sounds right.