Oh man, the seemingly mistake in the translation totally threw me off...
Sakuya said that Shameimaru arrived at "half past 6" in front of Remilia's door and interviewed her, which would give Shameimaru one hour after ending the interview with Meiling. But in the timeline it is correctly stated to be half past 5 instead of 6, so there is no gap.
But what I don't understand :
if only the murderer is allowed to lie, why does Meiling say that "between 10:00 and 17:00 no suspicious person entered the mansion"? And "Marisa arrived at 20:00". Since she was put on guard to keep Marisa away, it is clear to me that she did not tell the truth. Sneaking into the mansion is ruled out as far as I understand.
