Does anyone know how long it takes, after a show is released, for the numbers to get back to whatever powers that be, that a show has sold well enough, and is making enough of a profit to release further seasons of it? Maybe it's just the different studios and their particular preference for releases, but it seems that some shows are getting out faster than others. I know shows that had big ratings recently, Friends, for example, is probably a higher priority for the studio to release as quickly as possible, since they want the show to still be fresh in everyone's minds and be able to make a buck off of it. But what about something older, like a 50s era show, like Dick Van Dyke? How long did it take for the numbers to get back to the powers that be that this was going to be a moneymaker, and thus, get more than season 1 released? I know that the fans of The Mary Tyler Moore Show were quite disappointed that no further seasons have been released, and I am certainly an upset Mad About You fan, that I get two seasons and a "best of" set. In short, is there a standard amount of time for the studios to get the numbers, or does each studio have its own criteria, and thus, its own release schedule?