setInterval(function() {
    console.log('espera time: ' + $.espera());
}, 2000);

$.espera(30, function() {
    console.log('are you there?');
});

$.espera(60, function() {
    console.log('going ausente :)');
    $.ausente('autolejos');
});

$.espera(0, function() {
    if ($.islejos()) {
        console.log('back from ausente');
        $.ausente();
    }
});