I own a server with a 3500 map. Because of this I have giant excavator but is there a multiplier for it and if so what is it, I need to know the command.

Just change your config with the following (this is for x10 for everything):

  "Options": {
    "ExcavatorBeltSpeedMax": 0.1,
    "ExcavatorResourceModifiers":
	{
		"*": 10.0
	},
    "ExcavatorResourceTickRate": 3.0,
    "ExcavatorTimeForFullResources": 120.0,
    "GatherDispenserModifiers": {},
    "GatherResourceModifiers": {
      "*": 10.0
    },
    "MiningQuarryResourceTickRate": 5.0,
    "PickupResourceModifiers": {
      "*": 10.0
    },
    "QuarryResourceModifiers": {
      "*": 10.0
    },
    "SurveyResourceModifiers": {
      "*": 10.0
    }
  },​