[rsweeney21]

Missions are 2 years for men, 1.5 years for women. It's optional for both men and women, but men are expected to go.

I went on a mission to Peru for 2 years. It was amazing, I have no regrets, but I wouldn't do it again. It was incredibly hard.

In contrast, I've started two modestly successful companies (one bootstrapped, one backed by $16M in VC money) and I'm working on starting my third. Startups are grueling, but not as grueling as a mission IMO. :)

[joeblas]

I too went on a 2 year mission in Ohio and I second the statement that it was incredibly hard but totally worth it.

[paulddraper]

And the missions are served by either young adults (18-25) or retirees.

I.e. at times that are minimally disruptive to careers, families, etc.