I try to modify the error log to show runtime duration. I added %T/%D at the end of the LogFormat at httpd.conf
like this:
<IfModule log_config_module>
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
# NOTE: "combined" and "common" are required by WHM
LogFormat "%h %l %u %t \"%r\" %>s %b" common
LogFormat "%T%D %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %T/%D" combined
# access_log format can be set in WHM under 'Basic cPanel & WHM Setup'
CustomLog logs/access_log combined
</IfModule>