How many hours did fischer vs spaskky, karpov vs korchnoi play?

Question by michael c: how many playing hours did fischer vs spaskky, karpov vs korchnoi play during their championship games?

Answers and Views:

Answer by WolverLini
That would take a detail of research that likely is not possible. The time controls for all those matches (IIRC) would be 2 1/2 hours for the first 40 moves for each player, I can’t find the controls past 40 moves.