I would ask before purchasing. Some tickets state they must be completely used by a certain date. In fact the other day I was trying to get into DL and the people ahead of me had tickets that were expired. They stated they must be used by a certain date, and they were withing the number of days from first use but not the end date. I don't know the specifics of that case, but for example, you purchase a 3 day hopper that expires on Aug 15, and must be used within 13 days of first use. If you use it for the first time on Aug 13, then 14, then try to use it on the 16th they will not let you use it, even though you are within the 13 days, you are past the overall expiration date. DL tickets vary with expiration dates, so I would check before purchasing the exact details.