https://steemit.com/steemit/@anaman/dissecting-voting-power-and-when-to-upvote

https://steemit.com/steem-help/@sykochica/answering-common-questions-about-voting-and-curation

tl;dr Wait 25min before voting & you get 25/30 of the reward pool. vote at 1min & you only get 1/30th !!

only vote max 10x / day
see https://steemworld.org/< username > for you voting power %

Hope that helps