Or just hook everything up and bleed the brakes!
I've never bench bled a master cylinder and I've worked in a lot of shops and done a ton of complete brake jobs over the years. Sure it takes 5 minutes longer, and uses a few ounces more brake fluid to bleed the brakes, but you'll spend 20 minutes tinkering around trying to bench bleed, and end up with brake fluid all over everything....
Want to do it even faster, spend $50 and buy a vacuum bleeder, you'll be done in 15 minutes and suck a quart of fluid through the system (if it was 'dry' to start).