Three seasons.
2 seasons
The series ended after seven seasons.
The series has concluded with 5 seasons.
there are 10 seasons
There are four seasons in the TV series "Emily of New Moon."
There are six seasons of the television series LOST which are on DVD.
The TV series "Johnny Test" has six seasons .
Looks like there were at least 4 seasons
In American terms, Friends only had one series because we consider a series the show as a whole. There was a spinoff of Friends called Joey, but it didn't do very well, and I don't know whether or not you want to consider that another series of Friends. I believe that in British terms, a series is one "year," per se, of a show, or what Americans call a season. There were 10 seasons, or series in UK terms, of Friends.
i think the most they've ever had is 6 seasons
There are 2 seasons to the anime series "Wedding Peach" (which has 51 episodes .)