Read hour markings from stdin and produce aggregated hour statistics per comment item.
Input format:
hh:mm:ss<tab>Comment
where <tab> represents the tab character (ASCII 9). Comment: one or more items, separated from each other by commas or semicolons.
Sample input:
01:30:00<tab>Thing1, thing2
04:00:00<tab>Thing2, thing3
Sample output:
0.75<tab>Thing1
2.75<tab>Thing2
2.0<tab>Thing3