A 10-F capacitor (100 nanofarads) is charged to 100 V and then disconnected. One can model the charge leakage of the capacitor with a RC circuit with no voltage source and the resistance of the air between the capacitor plates. On a cold dry day, the resistance of the air gap is 6 10 13 2; on a humid day, the resistance is 7x10 2. How long will it take the capacitor voltage to dissipate to half its original value on each day?