"With each tier of government comes an extra couple man-hours of management a week. Hamlets maybe 1-2 hours per week spent managing/meeting regarding the hamlet, villages 2-4, towns 4-6, cities 6-8, and capitals 8-10. Remember, at the point where you’re running a Capital, you’ve got 250+ people residing within your domain. These are of course estimates. Those people who prefer to be more hands-off can delegate many of the duties to others, and those who prefer to be more involved can walk the settlements making improvements themselves."
These are all "Mayor" I believe. It depends on your settlement size. If you have a small town, a couple hours a week is pretty easy to get over. Also, if you pledge at that level, I believe you gain access to a few souls. You (probably) can run most of your mayoral duties as an OPC (running a script) and run around in the meantime with an alt. Then hop in every once in a while to check on your mayor to set parameters, like where to build what, etc.
There will likely be options available to you. But at the moment, we have nothing concrete for the mechanics.