Writing a single book is a rewarding achievement. But writing a book series—a collection of interconnected books that build upon each other—is a massive undertaking. Whether you’re planning a fantasy trilogy, a nonfiction series, or a crime saga, the big question most writers ask themselves is: “How long does it take to write a book series?”
The answer varies based on several factors, including the number of books in the series, word count, genre, research requirements, and the writer’s schedule. In this in-depth blog, we’ll break down everything you need to know to realistically plan, schedule, and complete your book series.
What Is Considered a Book Series?
A book series is a collection of books that are connected through characters, settings, story arcs, or themes. There are different types of series, including:
- Sequential Series: Books must be read in order (e.g., “Harry Potter” or “A Song of Ice and Fire”).
- Episodic Series: Books can be read in any order, with recurring characters or themes (e.g., Agatha Christie’s Poirot novels).
- Nonfiction Series: Books that cover related topics (e.g., self-help guides, how-to manuals, or business series).
Most series consist of 3 to 7 books, though some extend far beyond that.
Average Time to Write a Single Book
Before we dive into how long it takes to write a series, we need to understand the average time to write one book.
| Book Type | Average Word Count | Average Time to Write |
| Fiction (Novel) | 70,000–100,000 words | 6–12 months |
| Novella | 20,000–50,000 words | 1–3 months |
| Nonfiction | 50,000–80,000 words | 4–9 months |
These numbers can vary based on writer experience, research needs, and available writing time.
How Long Does It Take To Write a Book Series?
On average, it takes 2 to 5 years to write a book series, depending on:
- Number of books (trilogy vs. 10-book epic)
- Book length
- Genre
- Planning/outlining
- Writing speed
- Time available per week
Approximate Timelines Based on Series Length:
| Series Size | Book Length | Total Time Estimate |
| Duology (2 books) | 60k–80k each | 1.5–2 years |
| Trilogy (3 books) | 70k–100k each | 2–3 years |
| Tetralogy (4 books) | 80k–100k each | 3–4 years |
| 5+ Book Series | 80k–120k each | 4–7+ years |
These timelines include drafting, revisions, editing, and time between releases.
Factors That Influence Timeframe
1. Genre
Fantasy and science fiction often require detailed world-building, which slows down writing. Romance or thriller series may move faster due to simpler structures or shorter lengths.
2. Series Planning
Well-planned series (with outlines and story arcs mapped in advance) are quicker to write because they minimize rewriting.
3. Author Experience
First-time authors may take longer due to learning curves, self-doubt, and trial-and-error. Experienced authors can often finish drafts faster.
4. Research Requirements
Nonfiction or historical fiction books require heavy research. That time adds up over multiple volumes.
5. Publishing Route
- Traditional publishing involves long waits for feedback, edits, and release dates.
- Self-publishing allows faster output but demands the author handle editing, formatting, and marketing.
Writing Fiction vs. Nonfiction Series
Fiction Series:
- Require strong character arcs across multiple books.
- Typically follow a story arc that escalates toward a climax in the final volume.
- Must maintain consistency in tone, setting, and plot threads.
Nonfiction Series:
- Are topic-based (e.g., health, entrepreneurship, productivity).
- Often easier to draft once a content structure is repeated across volumes.
- Less emotional but require more factual accuracy and referencing.
Real-World Examples from Famous Authors
1. J.K. Rowling – Harry Potter Series (7 books)
- Took 17 years from concept to final release (1990–2007).
- First book alone took 5 years to write.
2. George R.R. Martin – A Song of Ice and Fire (Ongoing)
- First book took ~5 years to write.
- Still working on book 6 more than a decade after book 5.
3. Brandon Sanderson – Mistborn and Stormlight Archives
- Writes at an average pace of 3–4 books per year.
- Uses detailed outlining to plan series years in advance.
4. James Clear – “Atomic Habits” Follow-up (Nonfiction Series)
- Though not yet a full series, successful nonfiction authors often plan multiple books around a core philosophy.
These examples show that timelines can vary greatly depending on the author’s approach, resources, and life events.
Suggested Writing Timelines for Different Series Types
1. Fast-Paced Writer (Full-Time) – Trilogy Example
- Book 1: 6 months
- Book 2: 6 months
- Book 3: 6 months
- Editing, formatting, publishing: 6 months total
- Total: 2 years
2. Part-Time Writer – Nonfiction Series
- Each book: 6–9 months
- 3-book series: ~2.5 years
3. Beginner Writer – Fantasy Series
- Book 1: 1 year
- Book 2: 1.5 years
- Book 3: 1.5 years
- Total: 4 years
Tips for Writing a Book Series Faster
1. Outline the Whole Series First
Planning plot arcs, characters, and themes across the entire series prevents backtracking and rewriting.
2. Maintain a Writing Routine
Consistency is key. Even 500 words a day adds up to a novel over several months.
3. Write Drafts Back-to-Back
Consider writing all first drafts before publishing any books to avoid continuity errors and plot holes.
4. Use Writing Tools
Tools like Scrivener, Plottr, or Dabble help organize large projects across books.
5. Minimize Perfectionism in Early Drafts
Get the words down first. Edit later. Perfectionism delays progress.
6. Set Realistic Deadlines
Give yourself deadlines, but be flexible. Life happens—leave room in your schedule.
7. Outsource Editing or Cover Design
This can save months in your production timeline, especially if you self-publish.
Conclusion
So, how long does it take to write a book series? The truth is: it depends on your goals, habits, genre, and level of preparation.
But here’s a general guide:
- A fast, experienced writer might finish a 3-book series in 2 years.
- A part-time writer working steadily might complete a 5-book series in 5 years.
- Beginners, or those working around jobs or families, might take 7+ years.
Writing a book series is a long-term commitment—but one that’s immensely rewarding both creatively and professionally. Whether you’re writing the next epic fantasy saga or a series of motivational guides, the key is to plan smart, write consistently, and stay passionate.
