Jill ~ There are many things that the management team weighs in when choosing new mods,and one of them is actitivity on the board you're applying for, there's no given amount of time you need to have posted on the board, but they do look for posters that are regulars on the board, not just someone who does casual visits, that's an important thing, to know your field
but you've been with us for a while now...I'd been a poster for a year or two when I became mod, but Kara had only been posting for a month, so it really varies...
if there's anything you want to ask about this feel free to do so and good luck!