maybe every 2 months a new election? The kage's could do lots of great things in 2 months imo.
But would you like to be stuck with a terrible kage for two months?
This is the charm of a long therm. People have time to see how the kage is, some people may want to assassinate him from shadow because they want the power, or maybe all the villagers will unite to dethrone him because he is horrible. In just one month you have time to do nothing, as a kage and as a player. Also, if there will be a kage once in a month, being a kage won't be something special anymore, will become something common. I would suggest to be even one year thus the player will have time to form an idea about their kage and to make plans related to this, this will mean that choosing the next kage will be a very important thing (so people won't say something like:"Hey, let's choose this month X-kun to see how he is, next month we can try Y-kun.". This way they will become just some sox: try it, wear it or throw it to the trash). So, because choosing a kage will become a very important decision it won't be something decided in one second, it will require some time for finding the suitable person. In addition if a kage is killed or dethroned, the village will be weakened, a small chaos will establish, a good oportunity for other villages or rogues to strike, making the game more fun.
If you will choose to let a guy be kage for one month or so, all those things won't happen and as I said, being a kage will be just humdrum.
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