The 75+ figure is just an extrapolation of my results, so it may be an inflated number. Still, if my 32 hours is only 40% of the pack's capacity (based on the deck's battery level meter), that would put the figure at 80 hours. If the current draw isn't linear (or, faster as the voltage drops), the total number of hours could be significantly less. I can't be certain until I run it dead, but I don't really plan to just to prove a point. For the record, my mics draw 4.6 mA each, so they are average. The LSD2 draws less, the Audix more.