Between masturbation, giving facials and sex with guys I've definitely cum more outside of women than in them.
As for quantity, let's do the math. My largest ejaculations have been about a tablespoon in volume (1/2 ounce.) The absolute smallest have easily been a teaspoon (1/6 ounce.) Figure an average of 1/4 ounce per ejaculate. But they all feel like a gallon or more.
I digress. In my youth I would ejaculate several times a day, now in my old age several times a week is plenty. Figure an average of twice a day over a period of 50 years. That's 18,262.5 days or 36,525 ejaculations, 9131 ounces or 71 gallons.
YUMMM!