Depends... If everyone's active and playing regularly then it shouldn't last more than 2 weeks. I'm fairly certain that the WiiLeet will be finished within that time, but because the MiiLeet has some newer members/players it's harder to tell!
It will be a miracle if we complete a season without any drop outs though, so stay tuned!
That reminds me, there is a possibility of running a 'Goal of the Season' comp. When you score a goal that you think is worthy of such a glorious title, simply grab the nearest video capturing device and record the replay! At the end of the season we can have a vote on which goal deserves the title
So make sure you have your phone/camcorder ready!