Remove "(Repeats Every Week Until…"

This can easily be done editing the CSS file.

With that said.. you should always make backups of your files, use a child theme, and or an Edit CSS plugin, like the one in Jetpack, that doesn’t permanently change your CSS file.

Do you know how to use the “Inspector” in Firefox or Chrome.. ? That is one way you can solve these “puzzles.”

#aec-modal .duration {
display: none !important;
}

In the CSS file will do as you request.

Have a great day !