olemus
seadmele DHCP-serverilt antava IP-aadressi kehtivuse aeg,
mille lõppemisel saab selle aadressi mingi teine seade

täpsemalt
https://homenetworkadmin.com/dhcp-lease-time/

https://www.techwalla.com/articles/what-is-dhcp-lease-time

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/dhcp-lease-times.html#id-dhcp-lease-time-validation-overview