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Batteries can be damaged if regularly taken below 50% of their capacity, so that 90 hours becomes 45 hours if you want to maintain a good service life of your battery.
Ive got a 120AH deep cycle and my waeco draws about 2 amps when its running, so it will drain my battery to 50% in 30 hours. But due to the thermostat, its only running about 50% of the time so that 30 hours then becomes 60 hours safe run time, lost of variables in this so could easily be half on a hot day getting opened all the time and warm refills (mmm beer)
Deep cycles are much better suited to running accessories and will handle being drained better than a cranking battery, if it is stuffed id be getting a deep cycle.
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