A period of time
An appointed time
of the hour
the small or wee hours
We just got back about an hour ago.
We haven't even been out for an hour yet.
She was still awake an hour later when Alex came through the door.
An hour later she found herself staring vacantly into the fire again.
Even if he was a Mormon, how could he make plans with this Darcie when he had proposed to her only an hour ago?