It's amazing how quickly it adds up, when you look at it that way. That's how I did roughly 30K in three years. A few each day.
Of course, I was in goal-oriented mode then -- so many posts per day, so many new topics per week, so many different forums I wanted to hit, so many newbies to greet, etc. I was in forum-building mode then. Didn't really care about the total number, but all the little goals on the way.
But still. Numbers are what they are. 30 a day adds up a lot more quickly than you might imagine.