I went from a 16 km bike commute to a 3 km one, and 3 km isn't far enough. I usually leave early to spend a little more time on my bike. On an average day the morning ride is the best part of my day.
3km is not so much. From spring to fall I also use my bike for going to work. One way is 21km and it feels great. Often In the morning I would like to make an extra round.