A player can easily get up to 3k Ebon Vanguard Reputation Points after clearing Dalada Uplands (Takes about 1 hour) and collecting bonus points from Scouts located near Resurrection Shrines.
Clearing Sacnoth Valley takes 50-80 min and ~4500 points can be gained (including bonuses from the shrines) per run. It's recommended to clear the Charr temple last (300 points per boss then, 4 bosses there).
Keep in mind that a boss gives more points after defeating a lot of creatures. After collecting over 250 kills in Dalada Uplands you will receive up to 300 points for killing each boss, which will get you 1000-1200 points from the bosses only.