Welcome to the world of running! There are many crazy runners in North America (I almost became one)! 2 marathons a month is really nothing to some of them. How about one marathon every single week for 52 weeks? Or what we call "Doubles", that is running back to back marathons. You run a marathon on a Saturday then take the plane to another city to run another marathon on Sunday morning, now that is really crazy!!
Here is a website showing a "Marathon Century Club", everyone in this club has run at least 100 marathon. Some almost close to 1,000 marathons!!