About Host Discovery

I want to know the time when the host is discovered.

vmWare discovery is set to 1 day.
The time when vmWare hypervisor nodes are discovered is always 23:57:05.
There is no place to set the discovery time in the Zabbix GUI, but the discovery time seems to be always fixed.

Are there any internal specifications for the Zabbix discovery mechanism?

If a vmWare in a different domain is discovered, will the discovery time change?

In the case of SNMP network discovery, the node is always discovered around 9:00.

Is there any specification on the Zabbix side for this?

Thank you in advance.