Put 'minutes since last git commit' into my bash prompt

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Project Description:
I use git, and I use bash.

I want my bash prompt to include the minutes / hours since my last commit, like so

project_folder (14 mins):


I don't know much about bash scripting, so it's up to you to work it out and give me the solution :)

Skills required:
Shellscript, UNIX
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alexheaton United Kingdom
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