Change Plesk Postfix Retry Time

Is it possible to change the time for mail to give up on sending (Retry) from 5 days which is right now to like 1 day or 12 hours for plesk postfix MTA?

Edit the following to /etc/postfix/main.cf near the top:

# nano /etc/postfix/main.cf
maximal_queue_lifetime = 1h
maximal_backoff_time = 15m
minimal_backoff_time = 5m
queue_run_delay = 5m

Source: http://www.postfix.org/postconf.5.html