Your 3600 would have the same differential as a 1952 GMC 150 series truck. This is taken from the 52 GMC Owner's manual. It should get you close. But the better answer is "until the oil falls out of the filler hole".
I like to remove the magnet for cleaning every year and slide it off the plug and use a clean white towel or paper napkin to get it as clean as I can .
Don't forget to add a magnet to the engine's oil drain plug too ! .
Magnets can always help...a few years ago I was reminded of those little square lead like pieces put in gas tanks...can you guess what they were? I kinda recall seeing lots of ads back in the 50s or 60s that they were supposed to be for improving power and gas efficiency. I also remember actually putting those into gas tanks but had forgotten that, till I was trying to figure this puzzle out. Another puzzle and another memory recalled.
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