We haven't done a double-header in such a long time, I'm not sure what my recovery time is anymore. Even back when we were dating, we would usually clean up and get dressed after one round, even if we ended back in bed an hour or two later. She is a one-and-done kind of woman, but that just means more than once in the same session.
In a previous relationship, we both were interested in going another round, so 15 minutes of so and starting with at least some foreplay again would be enough to get me hard again. Waaaay back, almost 30 years ago, I had my one and only multiple orgasm as I didn't get soft after having a 'small' orgasm while my girlfriend was riding me. She stopped riding for maybe a minute, but used her pussy muscles to squeeze me and keep just enough stimulation to keep me hard. That slowly transitioned into a slow ride, that eventually turned into full on fucking. The second orgasm was much more intense, and I needed the 15-20 minutes after that one before going for round three.