The leaderboard statistics are calculated nightly. Points won will not be applied until the next day.
Leaderboards are also calculated on a rolling 30 day schedule. Points that were won greater than 30 days ago will begin to drop off a players leaderboard points. This allows new players to climb the leaderboard and compete against players that have been player for longer.
Leaderboard points are earned by finishing a game. Different point values are awarded for different placements.