Prius battery capacity (3rd gen) 1.3 kwh. With the mild 40% DOD, available is 0.52 kwh.
A moderately-sized RV AC unit draws 1000-1200 watts:
Not allowed to post links... but google shopping search "Low Profile RV Air Conditioner-
9200 Btuh Coleman Polar Cub"
Say 1kw load * .52kwh = 31.2 minutes of air conditioning time.
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