I don’t think there’s a great explanation for it being linear. But if you ask him I expect you’d get some combination of:
- writing it in a mad frantic rush[1] every day and just getting slower over time
- it being harder to write novel things, or there being more to read in the morning
- family life, eg he has a toddler and would work in the early morning so maybe helping with the morning rush or going to bed later as the kid gets a bit older.
- covid breaking the usual schedule of ‘work frantically in the morning then come to the office to chat to colleagues
- linear increase in time spent reading fan mail in the morning
[1] I think he’d definitely say something like this.
- writing it in a mad frantic rush[1] every day and just getting slower over time
- it being harder to write novel things, or there being more to read in the morning
- family life, eg he has a toddler and would work in the early morning so maybe helping with the morning rush or going to bed later as the kid gets a bit older.
- covid breaking the usual schedule of ‘work frantically in the morning then come to the office to chat to colleagues
- linear increase in time spent reading fan mail in the morning
[1] I think he’d definitely say something like this.