Hello.
If Loot was a system-style extension over time, it would be very useful for us. Let me explain the system briefly.
For example, when we wipe our server, rocket launcher C4 rocket-style weapons and many items normally spawn in boxes. Thanks to this plugin we really need a plugin that can set the items we want like rocket spawning to spawn 6 hours after deleting them. I hope I could explain it briefly to the add-on. 
If such a plugin is available, could you please name it. Thank you.

Timed progression?

Yes, this looks like what I need. Thank you very much.