To many in my opinion.
3 is ABSOLUTE max. 2 is the best.
You have to have at the VERY LEAST 4-5 days during the week to be pursuing YOUR goals.
Juggling 7 girls seems like it would be taking away from QUALITY time spent on your hobbies/goals/education/reading/working out/meditating etc., etc., and ultimately becoming a better man in other aspects of life.
If girls come in between your path of perpetual betterment and hinder the progress of your goals/aspirations by taking up too much of your time, then you have too many and are wasting precious time by slaving over vag. Spend your time creating a legacy and have a b1tch or two on the side, and you will be more happy on your death bed knowing that you did something worthwhile in your life rather than toiling over pussi.
p.s. nice covert brag thread