I understand, but there are to many undeffind values.
Wat is the ocsilatortime of your HV-board, wat is the condition of your capacitor, wat is the laodtime of the capacitor, wat......aso.
Buy 100 cars of the same brand and drive them behinde each other on the road at the same time, same speed and every car is differend in consuming petrol.
You have to test it your self how long your batteries will live.