I'd rather not merge to master a design we haven't reached consensus on. Feature branches are an ideal place to play with UI design.

More specifically, I'd like to see a single value in the "Time" column, perhaps duration by default, and when you mouse over a particular cell, you get a Bootstrap tooltip which contains the three values (start, end, duration). See this link for more info on the Bootstrap tooltip:

http://getbootstrap.com/2.3.2/javascript.html#tooltips