1989 Accord, after 300,000 miles. The slipping got to the point at which the car couldn't move. Did D&Fs every 30,000 miles with synthetic ATF. I consider that to be a pretty good lifespan, honestly.
I remember some of our conversations on this car(I had an '88 Accord). The tranny didn't fail but, it was grinding quite a bit going from R to P on a cold day...340K miles. It to had many D&Fs with M1 ATF