Damn, these are some intense days.
Does your work take place in a single location (or building) while on an Extremely Short Timespan or a Race Against the Clock? Does it commemorate some big event and follows characters through it? Why not name it after that?
This is a Title Trope that spells out both a work's timeframe and (usually) its setting in the form of "X (Timeframe) in Y", with 'in' sometimes replaced with a more appropriate preposition like 'of'.
Sub-Trope of Time Title and "Number of Objects" Title. Compare Once Upon a Time film titles.
Examples:
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Animation
Comic Books
- 30 Days of Night
- Anno Dracula: Seven Days in Mayhem (a Double-Meaning Title — it takes a week, but it's also about the Anno Dracula version of the Council of Seven Days.)
- The One Hundred Nights of Hero
Fan Works
Films — Animation
Films — Live-Action
Original titles
- 12 Days of Terror
- 12 Years a Slave
- 2 Days in the Valley
- 20 Days in Mariupol
- 55 Days at Peking
- (500) Days of Summer
- 7 Days in Entebbe
- 7 Days in Havana
- 7 Days in Hell
- A Day at the Races
- Four Days in November
- Four Days in September
- Last Days in Vietnam
- A Night at the Opera (1935)
- A Night at the Roxbury
- A Night in Casablanca
- One Day in September
- One Night at McCool's
- One Night in Lisbon
- One Night in Miami...
- One Night in October
- One Night in the Tropics
- Seven Days in May
- Seven Years in Tibet
- Three Days In August — a 1992 movie dramatizing the 1991 Soviet coup attempt
- Three Days of the Condor
- Three Thousand Years of Longing
- Two Weeks in September
- Weekend at Bernie’s
Completely Different Titles
- Die Hard with a Vengeance's French title is Une Journée en Enfer - "A Day in Hell".
Literature
- The 120 Days of Sodom, with its film adaptation combining this trope with an Either/Or Title.
- Eighteen Days To Graduation
- 30 Days in Spring
- Around the World in Eighty Days is an inversion of this trope.
- Five Weeks in a Balloon
- From Goosebumps:
- Homicide A Year On The Killing Streets
- A Month In The Country
- One Day in the Life of Ivan Denisovich
- One Hundred Years of Solitude
- Seven Days in May
- Two Weeks with the Queen
Live-Action TV
- 9/11: One Day in America
- CSI's episode "A Night at the Movies," concerning a murder during the showing of a film in a movie theater
- Seventeen Moments of Spring
- Ten Days In The Valley
- "The Three Days of the Hunter Job" from Leverage
Music
- "A Day In The Life" by The Beatles
- "One Night in Bangkok" from Chess (1984)
- "Seven Years in Tibet"note by David Bowie
- One Night In Hackney by Dynamo City.
- Queen (Band):
- A Day at the Races (Album)
- A Night at the Opera (1975)
- "One Year of Love" from A Kind of Magic (1986)
- "30 Days in the Hole" by Humble Pie.
Tabletop Games
- Ten Days In The USA
- 30 Nights is a Shadowrun 6e sourcebook about the day-by-day events of a 30-day blackout in Toronto.
Theater
- A Day in Hollywood/A Night in the Ukraine
- One Night In Venice (Eine Nacht in Venedig), operetta by Johann Strauss, Jr.
Video Games
- 7 Days to Die
- Ninety-Nine Nights
- 99 Nights in the Forest
- Army of Two: The 40th Day
- Three of the Chzo Mythos games follow the pattern — 5 Days A Stranger, 7 Days A Skeptic, and 6 Days A Sacrifice.
- Five Nights at Freddy's
- Fangames and parodies often keep this naming style, such as Five Nights With Bud, Five Nights at Chuck E. Cheese’s, One Night at Flumpty's, etc.
- Six Days In Fallujah
Visual Novels
Real Life
- The Five Days of Milan and the Ten Days of Bresica from the First Italian War of Independence.
- The 24 Hours of Le Mans, an endurance race where teams of race car drivers aim to cover the most distance in 24 hours with no breaks.