Is it true that HK tourist travel pass is valid for 72 hours once used for the first time?

Yes, it is true! The Airport Express Travel Pass is valid for 72 hours once used for the first time, plus additional hours up to the end of train service on the last day.

That is to say, if you start to use it at 9:00, Thursday, it is valid until the end of train service on Sunday.

Thank you so much!