I have noticed that the lease time does not show up correctly on Web UI (OpenWRT shows correct lease time remaining).
Initially the default lease time of 24 hours shows up fine, but I changed mine to 100080 minutes (1 week) and after rebooting a couple of times, incorrect values are shown (for example 15 hours remaining show in Web UI, while 6 Days and 19 Hours show in OpenWRT).
Not a huge bug but more of a cosmetic issue.