Henry Newman as-of-roleplay (stuck in a medfant setting leading a civil war (rather poorly) ):
1 day left to live
Sits down, writes the same letters as in the 1-hour version though they'd come off as less rushed.
After that I think he'd write one more letter making sure his wordly possessions end up in the right hands, then take a bunch of money and go spend it. Find the most expensive brothel with the best food and spend the majority of the final day surrounded by pretty women and fancy dishes, indulging his physical needs.
If Melodie Ashen was around he'd spend at least some of that time with her as well. She'd be the only person in Wyderia with whom Henry would be semi-comfortable discussing fear of death.
He'd make sure to get back home before time runs out though. Do some self-reflecting, maybe have a cry at the inevitableness of it.
And then end the day with a cup of hot tea just like in England.
1 hour left to live
Henry appreciates words. So he'd sit down at his table and write three letters:
One addressed to Mr. Clarke, informing him that the real test for the englishpeople was for them to be either face their worst fears or to become a member of Red Pawn at heart. If neither requirement is met then the person won't be allowed to return to England even when they succeed in winning the war.
One addressed to his former boss, Montgomery Hammond. This would be the longest and most "impressive" in terms of technique. At first glance it would appear as an acknowledgement of Henrys passing, with naming Hammond as his successor and pleading him to offer financial support to a group of Red Pawn supporters whose vision Henry was fond of. However, hidden between the lines with invisible ink would be a shorthand of everything he remembers of the demon-investigations back in England, so his former boss would have a thread to follow if he ever does get back.
Final letter would be the shortest but take the longest amount of time to write. Addressed to Melodie Ashen and, after a lot of strikethroughs, just saying: "I'm sorry I didn't get to take you out for that cup of coffee."
EDIT:
Found when perusing old roleplay sessions with the character, felt topical:
"If I die tell Melodie to tell Terry to tell Angus I love him and that he's a good boy." - (originally said by Henry when using a shaving knife for the first time)