Maximum number of teams and leagues
This article will explain the maximum number of teams that can be joined in private and regular public leagues.
Public & Private Leagues:
Managers, will have a limit of eight teams or leagues to join in any combination of private or custom, Head-to-Head, Rotisserie or Fantasy Points, with a single Yahoo! ID.
Managers will be able to join an unlimited number of Pro Leagues. These teams will not count toward the 8-team limit for private/public leagues.