I think you don’t understand the basics of networking, VMs and a lot more in IT…
For one, a DHCP allocated IP will be “held” to the VM as long as it runs, even reboots. Leases just get renewed, not a completly new deal! If you rent a car, and extend your rental, you won’t have to get a new car and contract… Same thing here…
Second: Servers, as VMs generally aren’t “workstations” with someone in front of a screen, should always use the same IP, and as such it’s often better to set this once and for all - manually, or with a DHCP reserved IP. NethServer makes this simple, as you can reallocate the IP to what you want when you reserve it.
DHCP - in all known operating systems to me (And that’s a lot!) use seconds when defining the scope. 3600 is an hour 86400 a day. What’s so complicated about that?
You’re simply wasting your time and ours!!!
Sorry if I sound a bit harsch here, maybe just had a hard day and am exhausted!
My 2 cents