You can control the settings and operation of the binary log file with the dscontrol binlog command.
>>-dscontrol--binlog--+-start----------------------+----------->< +-stop-----------------------+ +-set--+-retention--hours--+-+ | '-interval--seconds-' | '-status---------------------'
The number of hours that binary log files are kept. The default value for retention is 24.
The number of seconds between log entries. The default value for interval is 60.