Minimum amount of people for harem? Silly question, but how many people do you need at minimum in a love-triangle (or love-polygon, whatever) for something to be classified as a harem manga/anime? If "only" three people are involved, and not even at the same time, would that already be a harem?
From Wikipedia:


  Harem (ハーレムもの hāremumono; "from harem") in anime and manga is an emphasis on polygamous or love triangle relationships characterized by a protagonist surrounded amorously by three or more members of either the same and/or opposing gender, sex, and/or love interests


So three people is enough to be classified as harem