Setting a timer to a indestructible vehicle script

[ftshill]

On my server I am trying to add a script which makes all locked vehicles indestructible after a certain time period. This is to prevent the continuous grifing..

This is what I have so far:

if (isNil "fnc_vehicle_handleDamage") then {

fnc_vehicle_handleDamage = vehicle_handleDamage;

};

vehicle_handleDamage = {

private["_unit","_result"];

_unit = _this select 0;

if (locked _unit) exitWith {_unit allowDamage false;};

_unit allowDamage true;

_result = _this call fnc_vehicle_handleDamage;

_result

};

Can anyone help me to add a timer to this so it only activates after 15mins of being locked and untouched..

Thanks in advance!