What is the classical time control for a world championship game ?

Fischer vs Spasky for example , did they play 40 moves in 2 I/2 hours
? Then after the 40 moves they get 5 min a move ?



Are the rules the same for the next world championship game ?

why not play Rybka at world championship time controls ? Would
Rybka kill humans because it could think of so many moves in that time
limit. ?

How about Rybka vs Deep Fritz at world championship time control ,
who would win that?