How to Change timer Events

Hey, how can I set it, that an Event starts every 3 hours? For example 1 pm Easter and 4 pm christmas etc. How do I set this up? I have it like this now:

{
  "Settings": {
    "Announce On Plugin Loaded": true,
    "Announce On Event Triggered": true,
    "Use GUIAnnouncements Plugin": true
  },
  "Chat Settings": {
    "Next Event Command": "nextevent",
    "Run Event Command": "runevent",
    "Kill Event Command": "killevent",
    "Chat Prefix": "[AutomatedEvents]: ",
    "Chat Prefix Color": "#00FFFF",
    "Chat SteamID Icon": 0
  },
  "Event Settings": {
    "Bradley Event": {
      "Enabled": false,
      "Display Name": "Bradley",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 30.0,
      "Maximum Time Between (Minutes)": 45.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": false,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false,
      "Maximum Number On Server": 1,
      "Exclude Player's Entity": true
    },
    "Cargo Plane Event": {
      "Enabled": false,
      "Display Name": "Cargo Plane",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 30.0,
      "Maximum Time Between (Minutes)": 45.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": false,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false,
      "Maximum Number On Server": 1,
      "Exclude Player's Entity": true,
      "Normal Event Weight (0 = Disable)": 60.0,
      "FancyDrop Plugin Event Weight (0 = Disable)": 20.0,
      "PlaneCrash Plugin Event Weight (0 = Disable)": 20.0
    },
    "Cargo Ship Event": {
      "Enabled": false,
      "Display Name": "Cargo Ship",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 30.0,
      "Maximum Time Between (Minutes)": 45.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": false,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false,
      "Maximum Number On Server": 1,
      "Exclude Player's Entity": true,
      "Normal Event Weight (0 = Disable)": 80.0,
      "RustTanic Plugin Event Weight (0 = Disable)": 20.0
    },
    "Chinook (CH47) Event": {
      "Enabled": false,
      "Display Name": "Chinook",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 30.0,
      "Maximum Time Between (Minutes)": 45.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": false,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false,
      "Maximum Number On Server": 1,
      "Exclude Player's Entity": true
    },
    "Helicopter Event": {
      "Enabled": false,
      "Display Name": "Helicopter",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 45.0,
      "Maximum Time Between (Minutes)": 60.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": false,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false,
      "Maximum Number On Server": 1,
      "Exclude Player's Entity": true,
      "Normal Event Weight (0 = Disable)": 60.0,
      "HeliRefuel Plugin Event Weight (0 = Disable)": 20.0,
      "PilotEject Plugin Event Weight (0 = Disable)": 20.0
    },
    "Santa Sleigh Event": {
      "Enabled": true,
      "Display Name": "Santa Sleigh",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 30.0,
      "Maximum Time Between (Minutes)": 60.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": true,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false,
      "Maximum Number On Server": 1,
      "Exclude Player's Entity": true
    },
    "Christmas Event": {
      "Enabled": true,
      "Display Name": "Christmas",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 60.0,
      "Maximum Time Between (Minutes)": 120.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": true,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false,
      "Maximum Number On Server": 1,
      "Exclude Player's Entity": true,
      "Normal Event Weight (0 = Disable)": 20.0,
      "AlphaChristmas Plugin Event Weight (0 = Disable)": 80.0
    },
    "Easter Event": {
      "Enabled": true,
      "Display Name": "Easter",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 120.0,
      "Maximum Time Between (Minutes)": 180.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": true,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false
    },
    "Halloween Event": {
      "Enabled": true,
      "Display Name": "Halloween",
      "Disable Vanilla Event": false,
      "Event Start Offset (Minutes)": 0.0,
      "Minimum Time Between (Minutes)": 180.0,
      "Maximum Time Between (Minutes)": 240.0,
      "Minimum Online Players Required (0 = Disabled)": 0,
      "Maximum Online Players Required (0 = Disabled)": 0,
      "Announce Next Run Time": true,
      "Restart Timer On Entity Kill": true,
      "Kill Existing Event On Plugin Loaded": false
    }
  }
}

Running events at fixed times is not supported.

 

mhm okay but what are the settings for then?

 "Minimum Time Between (Minutes)": 30.0,
      "Maximum Time Between (Minutes)": 45.0,​

Get a random time for the next event to run between the minimum and maximum values