Delay before seeing updated Certificate in browser

Short answer, 'no' - I set all these up many years ago and haven't needed to adjust anything. I believe this might be pushing the 'support' boundaries however if you could assist with:
a) where the config files for virtual directories might be - here is where the php files are:

/var/www/html-allcountyguitar

b) specifically what needs to be adjusted within the config file - e.g. remove "xxx" replace with "zzz"

c) other aspects such as restarting services, etc.

Anything in the above regard would be appreciated however this forum already has moved me in the correct direction. Many thanks!

best,
Brian