Change the display time of exception message magento 2
To change the time please copy this file
vendor\magento\module-ui\view\frontend\web\js\view\messages.js
to your them to be in this path
app\design\frontend\{vendor}\{theme}\Magento_Ui\web\js\view\messages.js
then modify this function
onHiddenChange: function (isHidden) {
var self = this;
// Hide message block if needed
if (isHidden) {
setTimeout(function () {
$(self.selector).hide('blind', {}, 500)
}, 5000);
}
}