I am confident enough that I could do it, as far as my knowledge of English goes. -I've actually informally looked over a few texts.
I've already said that I am much better at noticing everyone's else's mistakes than correcting my own, for the exact same reason of remembering what I intended to write and kind of losing my focus over it hence. ...And I tend to make quite a lot of mistakes in the initial text, mostly because it can be hard to follow what keys I hit if I'm typing some 140-160 words in a minute (Just how do those professional typers manage with their 200-word-per-minute requirement!?) and my thoughts occasionally leap into another direction mid-sentence, which in return leads to some quite queer and nonsensical formations. (The more tired I am, the more often the latter happens.)
Granted, I don't exactly have very much time to spare myself and I already have something to finish... But as far as it goes, chances are that I'd still be capable of finishing both quicker than your mentioned rate. (No, not 60-70 years. Consider around two months, and that is probably more than it'd realistically take. I simply won't risk giving out set deadlines for myself I am not completely certain I can definitely keep.) I'd also need a few specifications in that case- mixing UK English with US English etc. might not always be that good an idea...
(Pft, and Aemoten was actually quite silent the entire first night and day, only talking towards the evening and then mostly to Immanuel. The same with most of the next morning, till he woke up properly. Don't know when he managed to irritate Gerald so, unless it was for him realizing that the other is keeping something for himself and then persistently attempting to uncover it. -Which he, in retrospect, was quite likely to do.
Aemoten is not a constant talker in the sense of chatting with someone all the time on whatever topic; he mostly speaks up when he has something more-or-less informative to say or comment, though he more often than not can be quite elaborate on the matter. ...That unless he is agitated and, with Annabelle not failing to give him reasons to be, he might this far have left a slightly uncharacteristic impression of himself with his annoyed tirades. (Compared to the original of him I had, anyway.) )