For moms who fed on demand?

It has been 1 week since my baby has been born. I am feeding on demand. Has anyone who fed on demand feel like they were literally feeding ALL THE TIME or is it just me? I have been logging the feedings and it's to a point where there are only 15-45 minute breaks *most* of the time. There are two 3-hour breaks. One in the afternoon and one in the evening. There is also a 5 one in the middle of night. It just seems like he is a "cluster" feeder. He eats for 3 hours and sleeps for 3 hours...