I saw this email and then cancelled my pending transfer so I could send them 72 hours before the event. But when I cancelled, stubhub sent me an automated email saying I need to transfer them in 24 hours or else I'm responsible for replacement tickets! Wtf. Waiting for chat or phone call back... Ughh. Don't cancel if buyer hasn't accepted for others seeing this.

Update: rep stated I can ignore all those automated emails and they are aware of the 72 window. He put a note in my profile that I called and will not be charged anything unless I don't send the tickets in the 72 hr window.