One doctor, my OB, said 3 months. My MFM said 6 months and another MFM I met with was okay with 6 months as well.
It ended up taking nearly a year (c-section/loss was Sept.28, 2009, got positive pregnancy test with DS around Sept. 11th 2010.) When my OB did my c-section to deliver my son, she was really really pleased with how well my classical incision had healed. (As long as you make it past 28-29 weeks, they typically try to do a regular c-section incision and leave the higher risk classical incision alone.)
Me (29) DH (30)
#1-Olivia Caetlyn-9-28-09-9-28-09, 23+2 wks, emergency classic c-section, class I HELLP, IUGR
#2- Lucas Oliver (rainbow baby)- April 2011, 36+2 wks, HELLP and pre-e free! (lovenox and LDA pregnancy)
#3-Matthew, late October 2012...mostly normal, 37 wks, (lovenox and LDA again)
My blog: http://www.butterflies-and-rainbows.blogspot.com/