To have an idea, look at the service Toggl.
Generally one find himself with many activities, but can't control how much time would dedicate to each activity, so, in order to measure this my idea consist in putting a "start" button in the row that correspond to that task, and then press again to stop it.
One would be capable of seeing how much time was dedicated to that task and also segregated by project if the task belongs to a project. The approach consist in dedicate an amount of time for projects, like a "budget" and try to fill it. Also at the end of the day one should be able to see where his time were employed, by task or project. The last detail to cover would be the time that take the use of doit.im when one plans, schedule, referral, assign task or change their state in order to see how much time we dedicate to "plan/review".