A 1hour session is not an adventure IMO maybe a session or a side-trek at best.
I will continue to harp on this point until it sinks in to everyone on the forum. I don't mean to come across as a jackass but this blindingly obvious concept seems to have passed quite a few of you by.
Instead of stringing Encounters (that were predominately but not exclusively of the combat variety) together to form a larger narrative as was the design paradigm for 4e. DNDN (or 5e) suggests a paradigm shift wherein the larger narrative will consist of Adventures strung together.
An Adventure is a more meaty version of the Encounter that supports all 3 Pillars (Combat, Exploration, Interaction) and becomes the DM's basic building block of storytelling.
I think a few examples are needed to illustrate this so let's pull some from a source most of us are familiar with, The Hobbit. This may contains spoilers.
The Hobbits tells an epic fantasy story but can be broken down into smaller pieces. (Side thought - maybe instead of Adventure we can us the term Chapters to describe this building block.)
What follows is a simple breakdown of how one DM may adapt the story and use it as a foundation for a DNDN story.
With a little help from Wikipedia:
Adventure (or Chapter) One
Gandalf tricks Bilbo into hosting a party for Thorin and his band of dwarves, who sing of reclaiming the Lonely Mountain and its vast treasure from the dragon Smaug. When the music ends, Gandalf unveils a map showing a secret door into the Mountain and proposes that the dumbfounded Bilbo serve as the expedition's "burglar". The dwarves ridicule the idea, but Bilbo, indignant, joins despite himself.
The group travel into the wild, where Gandalf saves the company from trolls and leads them to Rivendell, where Elrond reveals more secrets from the map.
Adventure (or Chapter) Two
Passing over the Misty Mountains, they are caught by goblins and driven deep underground. Although Gandalf rescues them, Bilbo gets separated from the others as they flee the goblins. Lost in the goblin tunnels, he stumbles across a mysterious ring and then encounters Gollum, who engages him in a game of riddles. As a reward for solving all riddles Gollum will show him the path out of the tunnels, but if Bilbo fails, his life will be forfeit. With the help of the ring, which confers invisibility, Bilbo escapes and rejoins the dwarves, improving his reputation with them. The goblins and Wargs give chase but the company are saved by eagles before resting in the house of Beorn.
Adventure (or Chapter) Three
The company enter the black forest of Mirkwood without Gandalf. In Mirkwood, Bilbo first saves the dwarves from giant spiders and then from the dungeons of the Wood-elves.
Adventure (or Chapter) Four
Nearing the Lonely Mountain, the travellers are welcomed by the human inhabitants of Lake-town, who hope the dwarves will fulfil prophecies of Smaug's demise. The expedition travel to the Lonely Mountain and find the secret door; Bilbo scouts the dragon's lair, stealing a great cup and learning of a weakness in Smaug's armour. The enraged dragon, deducing that Lake-town has aided the intruder, sets out to destroy the town. A noble thrush who overheard Bilbo's report of Smaug's vulnerability reports it to Bard, who slays the dragon.
Adventure (or Chapter) Five
When the dwarves take possession of the mountain, Bilbo finds the Arkenstone, an heirloom of Thorin's dynasty, and steals it. The Wood-elves and Lake-men besiege the mountain and request compensation for their aid, reparations for Lake-town's destruction, and settlement of old claims on the treasure. Thorin refuses and, having summoned his kin from the mountains of the North, reinforces his position. Bilbo tries to ransom the Arkenstone to head off a war, but Thorin is intransigent. He banishes Bilbo, and battle seems inevitable.
Adventure (or Chapter) Six
Gandalf reappears to warn all of an approaching army of goblins and Wargs. The dwarves, men, and elves band together, but only with the timely arrival of the eagles and Beorn do they win the climactic Battle of Five Armies. Thorin is fatally wounded and reconciles with Bilbo before he dies. Bilbo accepts only a small portion of his share of the treasure, having no want or need for more, but still returns home a very wealthy hobbit.
Obviously this is very quick and dirty and you can probably break The Hobbit down into fifteen or twenty chapters but I think it does illustrate what is meant by Adventure in the DNDN context. Each stands on it's own but collective they tell a greater story. And because each contains all 3 Pillars there is a width and breadth to them that was missing in the 4e Encounters.
Thanks for listening,
Dave