I forgot to disconnect my charger for my iphone 5 at 8 am and i'm away from house about 2-3 hours, its also under a sheep type blanket

And the battery and phone itself is already messed up. I'm gonna be back home at 3pm. It wouldnt cause any harmful situations right?

Added (1). *gonna be back home the next day around 2 - 3 pm

It will be fine.