247 votesAnonymous commented
This feature (+ reports) would put Wunderlist more on the map as THE productivity software for business teams / freelancers. In order to improve things, you should know where your weak points lie. You could guess, but measuring is better.
An app that doesn't only shows what you want to do, but also how long you took to do it? What better way to boost productivity and explain to my customers what they're paying for?