You can pretty much go at whatever pace is best for you and people will keep tagging - I usually get at least one tag per thread per day from people, usually more. If you want to go faster, plenty of people are around who like going faster; if you miss a few days that's cool too. There's usually 3-4 new posts a week (unless there's an event - then everyone's tagging the event log) and lots of mingle posts where people tag out all over the place.

...one other unrelated thing I really like about it is that everyone has really fun Pokémon. You can "bond" with 1-2 Pokémon a week (depending on a few factors) and if you ask, the mods will write up a little personality blurb. I've gotten things like "Vulpix is overly proud of her beautiful tails" and "Wooper likes to sing and dance in the rain - he thinks there should be a play about that"....