Finished hour versus studio hour
Narration produces roughly one finished hour for every two to four hours of recording, editing and proof-listening, depending on experience and how much correction is needed. A 70,000-word book is therefore a multi-week project, not a weekend.
The splitter converts total word count into per-chapter recording and editing hours so the scale is visible before you start.
Chapter length is uneven by nature
Chapters in most books range widely, so a flat per-chapter estimate misleads. Working from actual chapter word counts, or from an average with a variance allowance, produces a schedule you can keep.
Scheduling around a day job means planning in short sessions and leaving buffer for re-records. The plan reflects that rather than assuming ideal conditions.
成品小时与棚内小时
每 1 小时成品音频，大约需要 2–4 小时的录制、剪辑与校听，具体取决于经验与需要修正的量。因此 7 万字的书是数周的项目，不是一个周末。
拆分器把总字数换算成每章录制与剪辑工时，让规模在动手之前就可见。
章节长度天然不均
多数书的章节长度差异很大，用统一的每章估算会误导。按实际章节字数计算，或用平均值加浮动余量，才能得到做得下去的排期。
要兼顾白天上班，就得按短时段规划并留出重录缓冲。计划反映的是这一点，而不是假设理想条件。