int FLAT_TIME = 300;
int MAXIMUMRANDOM_TIME = 1200;

void CreateCrystal()
{
    if (GetIsObjectValid(GetFirstItemInInventory()))
        CreateItemOnObject("nw_it_msmlmisc11");
}


void main()
{
    if (GetInventoryDisturbType() == INVENTORY_DISTURB_TYPE_REMOVED)
    {
        DelayCommand(IntToFloat(FLAT_TIME + Random(MAXIMUMRANDOM_TIME)), CreateCrystal());
    }
}