As my enemas are of the erotic kind, I tend not to exaggerate. If small, once a week will do. But I like to receive a bigger one, around 3 quarts, at least once a month. Of course if I find the friend, I can give them anytime....
Every day first thing the morning if at all possible. I do four quarts of near hot plain water and baking soda mix, taken very slowly while I edge myself repeatedly. I often orgasm near the end of the bag. If not, I repeat with a cool to cold fast enema using a balloon retention nozzle. This will definitely send my prostate into joyful spasms, usually at about the two quart mark.