League Of Augsburg - Fighting Talk

This may be an odd question but here goes.
Some friends and I want to try BLB, we've got 2 armies of 4 battalions, 2 squadrons, a light gun and a general and I'd like to know how long such a game would take.
We're all experienced wargamers, 20 years plus, but BLB is a completely new set of rules.
I don't expect answers on the lines of "2 hours and 37 minutes" but just a guesstimated reply.

Thanks in advance,
Dave

I reckon between an hour and 90 minutes for that size of force but it depends on how aggressive you are as players!