I would think that most nodes get the majority of their votes in the first day to a maybe a week after they are posted when they are on the Newest Nodes or the Front Page. After they roll off those the chance of getting a vote is a lot less.
If you base it off the $NORM for that day or week (possibly weighted more towards the day it was posted) you should account the bulk of the voting to be done on that node.
If a node continues to get votes after this time it makes sense to rank it higher (or lower for down votes), since that would indicate (to me at least) a strong staying power or usefulness of that node.

In reply to Re: Re: More useful "best" and "worst" nodes display by Ven'Tatsu
in thread More useful "best" and "worst" nodes display by deprecated

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