Free jQuery duration Plugins
All the Free jQuery Plugins about 'duration' are listed here.
Timer2 is a small and fast duration formatter that converts user-provided seconds into human-readable durations like 23:58:20, 1day 00:01:30, and so on.
A lightweight and configurable duration picker plugin that automatically calculates the duration (in seconds) between two dates & times.
differenceHours is a minimal jQuery plugin which compares the difference between 2 times and calculates/displays the duration in hours and minutes on the page.
A jQuery based Date Duration Calculator that displays the number of days, weeks, months and years between two dates you specify.