Symantec BE 2010 R2 upgrading to 2014

Hi,

I'm trying to find a way to upgrade our current BE 2010 R2 to 2014 butI can't seem to find some answers so i thought I'd post here.

1. Do I need to upgrade our current Be 2010 R2 to a 2012 first before jumping onto 2014? Or can I make the leap from 2010 to 2014 without any hitch?

2. What are some of the best practices when upgrading our BE to the most current version?

3. How long does the uprade take?

thanks guys for the help!!