( GOLANG ) Execution time in millionseconds

Hi
I need GOLANG developer who can work on Execution time on HTTP request for me
just create simple function

1) Send GET HTTP request to someone with any response
2) I need Execution time in millionseconds between request till response finished

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Before you apply to this job

1) You need ready to work and don't have any job pending
2) Max deadline is 1 day finished
3) Delivery job in fast time bonus plus +10%

Thank you