Response time- How do I extract response time in "ms" from this event?

[Tioluwani-Ada]

I  am beginner.  How do I extract response time in "ms" from this event? Thank you.

4.72.20.141 - - [27/Dec/2037:12:00:00 +0530] "POST /usr HTTP/1.0" 500 4998 "http://www.parker-miller.org/tag/list/list/privacy/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 Safari/7046A194A" 830
31.60.78.151 - - [27/Dec/2037:12:00:00 +0530] "PUT /usr/admin HTTP/1.0" 303 5071 "-" "Mozilla/5.0 (Linux; Android 10; ONEPLUS A6000) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Mobile Safari/537.36 OPR/61.2.3076.56749" 1361
162.135.142.180 - - [27/Dec/2037:12:00:00 +0530] "DELETE /usr/admin HTTP/1.0" 502 5002 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36" 4608
56.125.112.165 - - [27/Dec/2037:12:00:00 +0530] "GET /usr/admin/developer HTTP/1.0" 303 5006 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36 OPR/73.0.3856.329" 4650

[yeahnah]

Hi @Tioluwani-Ada 

I suspect this has been answered for you here

https://community.splunk.com/t5/Splunk-Search/Average-response-time/m-p/636409#M221021

Though your example input data is slightly different.