The amount of time it takes to proofread 100 pages depends on several factors, such as the complexity of the text, the amount of errors present, and the quality of the writing. Generally, it will take between four and eight hours to proofread 100 pages.
However, for more accurate estimates, some additional factors should be taken into account.
Reading speed: How quickly can you read? Are you someone who reads quickly and catches most errors at a glance? Or do you read slowly and tend to catch the finer details?
Knowledge of the language: Are you an experienced proofreader? Do you have an in-depth understanding of English grammar and usage? More expertise will equate to faster proofreading.
Document complexity: Is the document complex, with numerous errors and technical vocabulary? Or is the document more straightforward, with simpler language and limited errors? The complexity of the document can have a major impact on the proofreading time.
Quality of the writing: Are the sentences well-structured and the spelling and punctuation accurate? Or is the writing difficult to read and understand, making it harder to pick up on errors?
Overall, it can take several hours to proofread 100 pages, depending on the factors listed above. To get the most accurate time estimate, you may need to try proofreading a few pages before scaling up to the full document.
It's also worth noting that proofreading multiple times can drastically reduce reading time. Once a thorough pass is made, each subsequent pass should take less and less time, as the mistakes should be fewer and farther between.
If you need help with proofreading, there are plenty of quality services available, such as https://www.scribendi.com/.