Barring an errata the correct duration is 1 hour (checked via my hardcopy). I suggest filing a bug report with the Devs via the Help Center as the Bug Report forum is primarily for users helping users. Edit: Could you please scroll up and take that screenshot again (show the top of that entry)? I am not seeing the same thing you are. Edit 2: In my first edit I checked the SRD and did not see what you did. However, I then went and checked the PHB, and the PHB is showing what you are showing. So when you file the bug report please inform the Devs that it is the PHB with the bad data (not the SRD).