What is typical or how to determine the "Safety Threshold Voltage" for a larger aluminum electrolytic capacitor for proper bleeder resistor sizing?

I'm assuming max. 50V at this point.. but wasn't sure if there is a mathematical formula that I should know.

For reference i have 2 x 23,000 uF 75V aluminum electrolytic caps in parallel with a 54V charge voltage. I'm planning on using a 700 Ohm 10W resistor as the bleeder. (Should discharge in 1.25 seconds or so I believe)