Current description:
https://www.zabbix.com/documentation/2.4/manual/discovery/network_discovery/rule
Delay (in sec) This parameter defines how often Zabbix will execute the rule.

But what will zabbix do if network discovery still in proccess after delay come?

For example, if i scan 10.0.0.0/16, and delay 1 hour. i think 1 hour not enough to scan 65k hosts. should i change delay ? or zabbix care about it? or zabbix start another instance of network scan?