Whats the most amount of seasons a show has released at once?

Seinfeld is releasing 3 on Nov 23rd...

Absolutely Fabulous also released it's first three seasons together a few years ago.

But I think the record goes to Monty Python. which released the entire series at ones.

Pee Wee's Playhouse is releasing their entire series to DVD - that's 4 seasons (1986 - 1990).

I don't know if this counts, but Buena Vista is releasing Boy Meets World Seasons 1 and 2 exactly 3 months apart, that's a fast release for BV