Yes, we plan to automatically display this for listings, in the current Paid Listings version you can mention the duration in the listing package description. Also, it may be possible with a code snippet (e.g. by setting display areas for the Featured Date attribute).
I found a temporary solution. I add the duration manually in the translation from Loco Trasnlate so it’s display when the order is made or when the user stay over the star with the mouse.