I was divorced about 13 years ago. I was one of those unusual cases where the father actually won custody. My daughters at the time were 3 and 8.
Even though I made an effort to be home every night, to coach soccer, to visit the school whenever open houses or teacher confrences came up, time still flashed by and kids grow too fast.
I'm sure I would be monetarily much wealthier if I had taken the easy way out and dumped them on the egg donor, but I wouldn't trade these last 13 years for anything in the world.