There seems to be a lot of confusion about the so-called six second rule. Often a goalkeeper can take 10 or more seconds to release the ball without even violating the letter of the law, never mind the spirit. Here is some official rules guidance from the U.S. Soccer Federation:
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The six-second rule was introduced into the Laws of the Game about 20 years ago. This particular portion of the Law is noted for its not being called strictly to the rule — and there is a reason for that. The six-second count does not begin until the goalkeeper is clearly in possession of the ball and ABLE to think about releasing the ball into general play. Not while the goalkeeper is on the ground; not while he or she is recovering from a fall; not while he or she is rising: Only after the goalkeeper is clearly alert and ready to function.
Anything beyond that time is a matter for the individual discretion of the referee, who is the sole judge of the passage of time in a soccer game.
Finally, a point we emphasize in our answers to this and similar questions about goalkeeper release of the ball: Most of the time the offense is trivial as long as you are seeing an honest effort to put the ball back into play.
Also:
Many referees are too eager to begin counting the six seconds, as if those seconds were a magic number that could not be altered through the use of common sense. If you were to keep track of the elapsed time in goalkeeper possession in the top games around the world, you would find that goalkeepers use (and referees allow) anywhere from eight to ten seconds on average. The only time the top referees punish such infringements are when they become habitual and are clearly designed to waste time. Do not let this insignificant matter of a few seconds ruin an otherwise perfectly good game. Remember that the referee can always add time.
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(Note that the 8-10 seconds mentioned above would be in addition to the time used up while on the ground, rising from the ground, getting clear of surrounding players, etc.)