4a here -- I transitioned for 18 months. For the first 9 months or so of the transition I was con-washing and wearing buns/protective styles. At that point the difference between the textures was a bit much, so for the last 9 months I blowdried once a week to blend it better and continued wearing mostly buns and ponies. I wore it out every once in a while, but mostly PS just because it was easier.
Pics below are from Jan. 2005, about 2 months before I chopped. You can see there was a huge difference between the bone straight relaxed hair and natural hair when wet (click to see larger):
I chopped in March of 2005, at 18 months post relaxer: