Order of voting no longer matters within a window. The first window is set for 24 hours. So if you vote on a post within the first 24 hours, you get the same amount or reward, regardless of when other voters vote during that window.

Also, even if you vote after 24 hours, you can still get essentially the same return-on-vote (ROV) if your vote (and votes of others in the second window) are much larger than voters in the first 24 hours.