My bad. I read it wrong. Thought you meant in the ticket creation or updates.
I tried adding "AccountedTime" field in the Sysconfig Ticket -> Frontend::Agent::Dashboard and its not working so either its the wrong field name or it aint implemented.
You could have a look at that addon
https://www.cape-it.de/en/products/otrs ... nting.html maybe its something that would ease your pain.
Else than that, I remember seeing somewhere that there are some places that time accounting is disabled cause in Germany the link between accounted time and a specified worker is forbidden so its disabled in config but cant find the place where it is anymore.