I like to give enemas until the receiver is fully empty. That usually takes more than one or two, sometimes quite a few more.
This is also how I like to get them. If I'm solo, I often have long sessions. If I have a partner, getting us both cleaned out can take the better part of a day.
Not that it isn't fun, of course, and it leads to "other things," but a complete enema series leads to a greater sexuality, and a greater focus on sexual matters--at least it does so for me.
What about you?