removing the product from the cart after a while?

functions.php

add_filter('wc_session_expiring', 'so_26545001_filter_session_expiring' );

function so_26545001_filter_session_expiring($seconds) {
    return 60 * 2; // 2 mints
}

add_filter('wc_session_expiration', 'so_26545001_filter_session_expired' );

function so_26545001_filter_session_expired($seconds) {
    return 60 * 3; // 3 mints
}