It's pretty obvious different people view communication differently.
It's completely cool for you guys to go a day or two without any communication.
It sucks ass for me to go 4-5 hours without hearing something. I wish I weren't this way and even when I'm doing shit that keeps me busy or am focusing on my life I'm still wondering what the other person is doing and wanting to talk to them. For instance this weekend I went snowboarding and then took my mom out to dinner. All throughout the day I was wondering what the girl was doing, wanting to talk, etc. That's not only applicable to this relationship either, I've been this way with every girl I've been with. It's a little harder to say with my ex since we lived together for so long, obviously we talked every day. But before we lived together I was definitely this way.