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You would only get a day and a half to two days at full load on 100 gallons.
Are you just wantuing to have enough for three full days?
I might suggest a 500 gallon tank. Propane doesnt go bad.
At half load you will use 250 in four days or so. If three days is your goal and you will not be fully loading it (even in the hottest days of summer) then you should be fine.
I tend to overprepare because if power somehow doesnt get restored for a week I dont want to live for three days without electric.