I use the pre-action buttons all the time - well, when I am raising anyway. I've never used the "Call Any" button in my life.
Back to the original question... a lot of times it's nothing. I play multiple tables at once, so sometimes there are delays before I act, and it is certainly not a tell.
But, with that said, if you are looking for a very general strong/weak read here that will be right more of the time than not, I tend to think a long delay before a raise (not a call) means strength. The player is acting - and acting poorly.
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