关于obb维也纳到布达佩斯

Collect Ticket
You receive a collection code which you can use to collect your ticket from all ÖBB self-service machines or ÖBB ticket offices in Austria. Your ticket is ready for collection in only 15 minutes
我现在已经点了这个代码，邮件上说这个票只有15分钟效果，这个是说15分钟后这个票就失效还是说15分钟后要换代码呢?