Opened Plenny Bar

Hi there, often I don’t fancy a whole bar and would like to save some for another day.
once opened, how long is a plenny bar good for? Is there anything I can do to expand the shelf life once opened?

I don’t notice any difference if I leave half a bar in the packaging for days at room temp and tuck the end of the package under the bar to hinder airflow. I suspect it would be fine for weeks.

Indeed, they last a fairly long time if just resealed. However, if you do that I think it’s important that you didn’t bite the bit you left, as saliva would definitely impact shelf life. So maybe break off a piece with your hand if you intend to keep the rest for later.