hourly auth logs -> change to daily

[Colleen Morrissey]

Hopefully easy question - I recently rebuilt to v3.0.18 and the 
authentication logs in /usr/local/var/log/radius.log are being created 
hourly.  I want to change this to daily - where is the config for 
this?   I have my radacct detail files going daily via 
mods-enabled/detail but can't figure out config for the file = 
${logdir}/radius.log

Thank you in advance,

Colleen