I think if you aren't sure, you might want to stalk some and then give it a shot. Even if it isn't ideal you can adjust. I personally have people I tag with that don't reply for a day or two or reply regularly. Some that tag multiple times a day, some that get one or two in a day, others that won't tag for a few days and boomerang and then will come back in another few days.

The game has a lot of really varied tagging styles and most are happy to backtag so long as you aren't deadweight, you don't flake out while visibly being online constantly and tagging at a few other games, etc.

Also it tends to be a bit busier during events, which come a little past midmonth onward and the beginning of the month. The last month and this one aren't really indicative of pace since there have been a lot of hiatuses for school and illness.