that is insane lol
EDIT: Wait holy fuck did you say after Doppelganger? That's literally insane lol because Doppelganger and Jailbreaker is only 3 days apart, so there definitely isn't enough time for this whole election arc here.
/below is what I wrote thinking that you said before Doppelganger
according to the "A Certain Unified Calendar" (this is pretty old but it's accurate enough), the entire Doppelgangper stuff happened just within 10-11 October, and Kuroko was pretty occupied with the whole "boy who can see the future thing" up until 4 October, so Kuroko has to solve things here within a week for this to make sense. However, Kuroko only got back for more important stuff in Jailbreaker arc in 14 October, so this arc can take at most 10 days.
That sounds insane but Toaru timeline is kind of insane already lol
also, because I'm obsessed, I went and checked and Kuroko appeared in chapter 3, and at least 3 days have passed (there was tons of fighting after chapter 3 in the same day, then Misaki blacked out and slept for a full day in chapter 17, they went on some more adventure with more fighting, and they caught and got testimony from some girl in chapter 26 and a day passed then too). So we still have 7 more days to solve this before it doesn't fit within the timeline.
The second chapter of Mental Out begins roughly October 12, and we are on the same day until chapter 17. The bakatsuki calender puts Jailbreaker on the 14th, but I think the correct date should be 17-18th, concurrent with the DRAGON Arc in Index.
If I was asked what date this current chapter is, I'd hazard that it's October 15.