DHCP Lease Time/period

[somanet]

How can i change the DHCP lease time on the firewall settings ?

Am new installer to Opnsense Firewall
Kindly help me achieve the following
Configure the OPNfirewall with interface WAN port
to operate with a public ip My question is is it safe ?

Change the lease period to 30mins
below is my current lease period


   IPv4 Address. . . . . . . . . . . : 192.168.0.138(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.254.0
   Lease Obtained. . . . . . . . . . : 11 June 2026 06:37:46
   Lease Expires . . . . . . . . . . : 11 June 2026 08:37:46
   Default Gateway . . . . . . . . . : fe80::f690:eaff:fe01:fb24%17
                                       192.168.1.1
   DHCP Server . . . . . . . . . . . : 192.168.1.1
 
Also wish Configure the DNS and if its safe to issued with dhcp.