Is it a one time thing or what?
YouTube Comments – How Frequently is Upvoting YouTube Comments Allowed
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Best Answer
If there is a limit, I don't think it's publicly available. There does seem to be some sort of delay going on after a while after voting frequently then seeing whether the up-vote count on the most up-voted answer for a few videos changes.
As compared to Stack Exchange limit of 5 seconds there does seem to be as harsh limit (if any limit even exists).