public function getTimeEstimates($startLat, $startLon, $customerUUID = null, $productID = null)
    {
        $query = array(
            'start_latitude' => (float) $startLat,
            'start_longitude' => (float) $startLon,
        );

        if ($customerUUID !== null) {
            $query['customer_uuid'] = $customerUUID;
        }

        if ($productID !== null) {
            $query['product_id'] = $productID;
        }

        return $this->get('/estimates/time', $query);
    }