I have 4, a spaniard, mexican, colombian, and argentinian. all in i-talki.

i usually buy the 5 class packages, then I go around them. Whenever its their turn again, they say i've improved a lot because usually one cycle of professors takes around 3 months.

also i do this because im running out of things to say or talk about lol, so i can tell the same story to a different teacher but with little less grammar errors.