Change '#lp-pom-block-10' for the ID of the element you want to hide and make re-appear in both the javascript and the CSS. You can add multiple elements separating them by a comma ('#lp-pom-block-10, #lp-pom-button-75'). Change 5000 to adjust the timer, time is in milliseconds.
Javascript:
<script>
window.setTimeout(function () {
$('#lp-pom-block-10').show();
}, 5000);
</script>
CSS:
<style>
#lp-pom-block-10 {display: none;}
</style>