You set the DHCP Lease Time when you configure the DHCP Server.
I wonder about the Access Point Grouping in VLAN 40 and the definition for Student Wireless being bridged to VLAN41. Unless there's a complication that's not obvious, I wouldn't use VLANs at all in Grouping.
Change Adminstration to 'Bridged to AP LAN'. Instead of 'Bridged to VLAN41', change Student Wireless to 'Separate Zone' and put the Student interface on wlan1.
You set the DHCP Lease Time when you configure the DHCP Server.
I wonder about the Access Point Grouping in VLAN 40 and the definition for Student Wireless being bridged to VLAN41. Unless there's a complication that's not obvious, I wouldn't use VLANs at all in Grouping.
Change Adminstration to 'Bridged to AP LAN'. Instead of 'Bridged to VLAN41', change Student Wireless to 'Separate Zone' and put the Student interface on wlan1.