Hello,
I'm running a heavily modded server so this could very well be a conflict or a problem on my end. When I adjusted the time in the settings json to 1800 and reloaded, I was given the following:

(17:58:34) | Loaded plugin Bradley Protection v1.0.2 by Nobu

(17:58:34) | Failed to call hook 'OnEntityTakeDamage' on plugin 'BradleyProtection v1.0.2' (NullReferenceException: Object reference not set to an instance of an object)

at Oxide.Plugins.BradleyProtection.OnEntityTakeDamage (BaseCombatEntity entity, HitInfo info) [0x00007] in <709f8d6e602f4fe683e92117c0c0d494>:0

at Oxide.Plugins.BradleyProtection.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000e4] in <709f8d6e602f4fe683e92117c0c0d494>:0

at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <31122a27a2414cd799150f8677cf39d4>:0

at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <0fbce81d88d64454b3e7abb24df7026b>:0

at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <0fbce81d88d64454b3e7abb24df7026b>:0

Thanks for letting me know, I'll have a tweak with the plug-in later today and see about a fix. Nothing springs to mind as to why it's being caused but I'm sure I can find out.