Define a 'game'. You could get the basics of any 8-bit game done in a weekend. Heck even faster than that once you learn a game library or save enough code from previous projects.
My definition of a game is an interactive story or experiance that is provided through information provided directly and indirectly to the player. However this is acomplished is acceptable but the only measure for it's success is if people enjoy it, just like any other art.