You can repeatedly use these items as long as they are glass! They are expensive after all and you should get the full use out of them before they wear out. Just make sure you wash them out and sterilize them properly between uses.
You can reuse glass bottles many many times. There really isn't a set limit to how many times you can use them. It depends on how strong the glass is. It will either start to grow some kind of mold inside or it will break.