By default, how frequently are log files rotated?

Hourly rotation is not the default; rotating that frequently would create excessive overhead and fragment logs in a way that complicates analysis.

F5 BIG-IP uses the Linux logrotate utility, which is configured by default to rotate logs daily. This default schedule ensures logs do not grow unbounded while still retaining a reasonable history for troubleshooting without requiring administrator intervention.

Weekly is not the default rotation interval; daily rotation is the out-of-box configuration on BIG-IP systems.

A default rotation frequency does exist on BIG-IP systems (daily), so administrator configuration is not required to enable log rotation.