$ sudo npm install duration
$ sudo npm install -g duration

If want to update the duration package execute the command as below,

$ sudo npm update duration

Update package globally,

$ npm install -g duration

Git clone:

$ sudo  git clone https://github.com/rektide/duration.git

$ sudo  npm install -g ./duration

duration@0.2.0 /usr/lib/node_modules/duration

How to remove duration package :

You can uninstall or remove this package from your node_modules run the command as below,

$ sudo npm uninstall duration

Basic Information of duration NPM Package: