I will voice a different opinion on this.
Working more than a full time job will likely add stress, and reduce your time for life's enjoyments now (when you are younger, more vigorous, have more interest). To give up your free time now for a chance at pulling your ER in is, IMO, not a very efficient use of your lifespan.
Why not be aggressive with your investment (80/20, e.g) instead of getting a part time job? That's what I would do although I didn't follow my own advice when I was younger.