@lowhanger
To see what cron does : install the pfSense cron package.
"Hourly" will trigger the pfBlockerNG main update function.
If a feed is set to daily, then it will upgrade daily, not every hour.
The other way arround will not work :
If you set a feed to update every 5 minutes (if that was possible) and the main cron delay is 1 hout, then the "5 minute" won't work.
Btw : updating every hour a feeds is not needed : check for yoruself : feeds are not updated every hour. Probably not for days ..... More frequent updating can be considered as abusive, and some feed hosts might blacklist your request.