"apache" I had a GF that did this Tantra (I guess) stuff....delaying orgasm (both male and female) for hours. Our longest lovemaking sessions were more than 4 hours. We would have foreplay to the point of my ejaculation, cooling down for a few minutes before starting again, and this would happen several times before I woukd finally cum.
There were some breathing exercises to delay ejaculation that she had taught me. I could have several ejaculations per session. Of course, the recovery time, when you are younger, is rather quick...I would usually have another erection within five to ten minutes.
On her birthday I told her that she was going to get "something special" which ended up being a (just short of) three hour "Mickey Dee" session. I'd work her to the point of orgasm, stop a bit to cool her down, then go at it again until stopping again. Sometimes I would lightly blow on her clit and vaginal lip area and then start again.
When she finally had her last orgasm she said she'd get back at me and return the favor. She had a bit of trouble walking after the session.