This command starts the Monitor process for the tree TREENAME. By
default it forks into a daemon, sets the log output file to
/var/log/torrus/monitor.TREENAME.log, performs one monitoring cycle, and
sleeps until the next cycle is scheduled. In daemon mode the log file
can be reopened by sending it a SIGHUP signal.

Makes the daemon sleep for N minutes before starting the first cycle.
This would happen on the daemon startup and also after each configuration
recompilation.
For example, when monitor and collector start simultaneously, the collector
needs some time to retrieve the data being monitored.