Straight from the rule book
"The pitcher shall bring the hands together for not less than one second and
not more than 10 seconds before releasing it,"
Rule 6, Section 1, Sub E
So the way I read this is that the pitcher must pause for at least 1 second and no more than 10.
Technically speaking, the first thing that happens when the pitcher steps on the rubber is that she should appear to take the sign from the catcher, this occurs with the hands separated. There is not time specified for this action. Then once the pitcher brings her hands together she has a specified time before the pitch is initiated (that is hands separate). That is my interpretation. Literally, there is no rule that says there is a one second pause "once the pitcher steps on the rubber". The rules are more complicated.
It is a tangled web they weave (ASA)
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