A concentric Count Down Timer adapted from Mike Bostock's "Arc Tween (clock)".
All it needs is pause functionality and the text input boxes to be centered in the middle, if only there was svg input boxes.. Or alternatively could have d3 brushes in the center instead, similar to HTML5 ranges. Or even better add drag functionality to the indivdual time bar -> something to do.
https://d3js.org/d3.v3.min.js