It depends on which type of check you choose (proofreading, linguistic editing, revision).
Proofreading mainly deals with a purely formal check. We estimate that the proofreader can improve about 1,000 words of text in one hour.
Linguistic editing involves checking the stylistic and terminological features of the text. Here the reviewer needs approximately 30% more time depending on the linguistic quality of the text.
A revision also requires checking and improving the source text. You can expect a speed of approximately 600 words an hour for this kind of bilingual correction.
