Spawn one crate every 30-50 minutes?

Hi, Im sturggling to figure out to have just one crate with randomised loot from a list of items fall every 30-50 minuets? I do not need the multiple crates dropping as its a vanilla server with light mods on it. All i want to be able to do is have a single airdrop spawn and be able to change the random loot inside.

Does anyone ahve a config like this they can copy and paste to me?

Many thanks.

by default that is how it is setup to drop a supply drop every 30-50 mins if at least one player is online.

see this section.

Timer": {
    "Cleanup old Drops at serverstart": true,
    "Maximum minutes for random timer delay ": 50,
    "Minimum minutes for random timer delay ": 30,
    "Minimum players for timed Drop": 1,
    "Remove builtIn Airdrop": true,
    "Reset Timer after manual random drop": false,
    "Use Airdrop timer": true,
    "Used Airdrop timer command": "random"
  },