Вы идете в правильном направлении. Так же, как вы применяете fadeOut.
Вам нужно показать ваш div
через 10 секунд с помощью setTimeout
. Но вы должны по умолчанию скрыть это div
при загрузке страницы.
См. Пример ниже -
jQuery("#messageBox").hide();
setTimeout(function(){
jQuery("#messageBox").slideDown();
}, 10000);
setTimeout(function(){
jQuery("#messageBox").fadeOut();
}, 20000);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="messageBox">
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</div>