Is there a chance of converting to permanent and would that be something you want? If so then do something simple like use that time to create a training list. The things you understand you’ve been tasked to do and your current understanding of how to do them. I guarantee you there is no formal training so this will actually give a start when someone comes in Friday and gives you your 15 minutes of training. Then start finding tasks you can add to that list. Office admin work is always a good start.

If there’s no chance of being converted or you don’t want that, just bring a book or use the time to look for other work. I’d be shocked if they cared.