Currently, if you wanted to compare your time spent (in daily shutdown or weekly analytics), you only see your time broken down per channel, and/or can view individual contexts. But you can't see a simple comparison of time spent per context.
For example, if I just wanted to see how much time I spent per day or per week in my Personal context vs my Work context (vs any additional context), it's pretty much impossible. I'd have to add things up manually.