On my P4 386 system, Cron update takes 20-40 minutes to complete,
DNS reload of the 92MB pfb_dnsbl.conf takes 4-5 minutes.
2016-12-07 02:27:16 Daemon.Info 1.2.3.4 Dec 7 02:27:19 unbound: [66112:0] info: service stopped (unbound 1.5.10).
2016-12-07 02:31:23 Daemon.Info 1.2.3.4 Dec 7 02:31:26 unbound: [66112:0] info: start of service (unbound 1.5.10).
```During the reload, DNS fails, so it's not a bad idea to run cron update off-hours.
As for the Maxmind database, once it is rebuilt, there is no need to run```
php /usr/local/www/pfblockerng/pfblockerng.php dc
```until something breaks or a new MaxMind database is released and for some reason the cron MaxMind update failed.