I try and average about 5-10 posts a day, but that's not a quota or a hard-and-fast rule or anything. If there aren't as many threads that take my fancy on one particular day, or if real life is just busy, then I'll post less; conversely, if I have lots more free time or there are lots of threads that I'm interested in, I'll post more. But because of this natural fluctuation, I don't feel guilty when I don't post much for a particular period in time, as I know that'll probably bounce back up eventually. Like nature, I guess!