Use a format specifier.

[irfn]

Specific use case required me to change the default format duration.

Use case: Usage quota for a Saas service is measured in hours and minutes.

• 1 hour, 20 minutes used of 1000 hours
• 240 hour, 20 minutes used of 1000 hours

Note that i am using 240 hours instead of 10 days. Essentially some cases may required to omit some "units"

I have implemented this here.

https://github.com/irfn/HumanizeDuration.js/commit/846b0248391c56f59efcb5b70f270551ec8299c5

Currently have used a 3rd argument to specify the format like "H,M,S"

[EvanHahn]

Let's discuss this at the pull request, not here.