Shania Twain 1997 - 2000
Come On Over
12/16 Singles
Rihanna 2007 - 2008
Good Girl Gone Bad + Reloaded
8/15 Singles
Beyonce 2008 - 2009
I Am... Sasha Fierce
8/11 Singles
and the list goes on. Even if the album was amazing and all the songs were single potential, should the artist release it all? (Obviously not in the same time, like Shania, she expanded her singles over the years)
Six is the ideal number, if the album is full of single material. If not, then four. Anything more than six or less than four is really pushing it. I guess it just depends on the album, any re-releases, etc.