So I've added a really simple 1 day sprint, and placed a single task in it.
This single task has an estimation of 2 days, I've added a time spent value of 1d (so our estimation pie is half full)
Viewing the burndown chart, I see that I've still got 2 days worth of actual work remaining, is this correct?
It strikes me that if there's ability to track time spent, that the burndown chart would consider it?
If we're to use 'Estimation' field only, and modify that continually to make the burndown work, that the spent time doesn't provide much functionality.