How to store a banana that was cut in half to preserve the other half? I can usually only eat about half of a banana, and usually when I get sick of it I just throw it away. In the past, I've seen bananas cut in half at hotels and other places that provide breakfast, etc, and thought maybe I could do the same - just cut it in half, eat one half now, and eat the other half later.

My question is, how do I need to store a banana that is cut in half like this? Obviously the bottom part of the banana is exposed to the air and not protected by the peel. As well, how long can I keep a half banana around before it just plain goes bad? Or does the fact that it's cut in half even affect how it should be stored / how long it keeps?
Cut it in half before peeling, so that only the end is exposed.   Wrap the exposed end with plastic wrap, and place in the refrigerator.   The skin may darken, but that is okay.

You should get a day or two easily.

Or put all the half bananas in the freezer, and when you have enough, make banana muffins.