does any one know how much time judging takes when voting is finished
Well, I think judging don't take more than a minute. You would start judging from the first minute and you will keep doing that. Your judgement might change but your judging would not. I mean you still keep judging but your judgement might flow in the other way.
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Judging usually only takes a few days, and typically finalists will be posted by the end of the week where a contest closed.
For more information, check out the Contest FAQ, found here: