If you take the time to poke through the profiles of the accounting firms on this year's FORTUNE 100 Best Companies to Work For, you would find the following under Ernst & Young's "What Makes It So Great?":
Flexible scheduling at the accounting firm allows team members to choose one night each week during busy season to leave the office by 6 p.m.
I'm at EY, I just told my manager i'm choosing tonight as my 6pm day. He said I can use my free time to draft my 2 week notice.