for me its been 3 times.....im out there in my garage doing it again for the 4th time.......

My reasons:
Took my head off once.....to clean things up....put it back on.....ran fine
Took my head and intake manifold off......put a d16a6 head on( I have a dx) and converted it to mpfi.
It started....it ran fine...but I blew the headgasket...pulled the head off and sure enough I used some krappy oreilys gasket.
I go to honda spend 200 dollars on the best head gasket they got....new head bolts and honda bond sealer....
come back home and now im out there pulling my head off again.....this time im putting in a new water pump......milling the head....and its all going back on right....after a week my car will finally be done here in about 2 days....

Damn......