I have the tiny, square one. The shuffle, I think it's called. It's currently blinking an orange light. How do I know when it's done charging entirely, and how long will it take to charge?

Hm, I had the original shuffle so I'm not entirely sure.. but isn't there a light on it that glows orange when dead/dying and goes green when it's finally fully charged. It's probably the same case as that.. I think it might be on the top edge of the shuffle.. I vaguely remember seeing my neighbors.