The 45-minute episode format really works to make Figure 17 a special series. For most of the series, it allows the slice-of-life aspect to shine, giving events plenty of time to play out with no rush needed, and it really makes it feel immersive.
And then for the last episode with the final sci-fi battle, it is paced like the final 45 minutes of a film, again with the extra time allowing for things to play out without needing to accelerate the narrative. It really feels like the final act of a movie rather than an anime episode.
It's all just part of the reason that Figure 17 is my co-favorite anime of all time, sharing the top spot with Utena, of all things. The two series are so different that they can't be compared apples-to-apples, and I can't decide on just one as my favorite, so they both are!
That, and the ending theme by TeddyLoid and Bonjour Suzuki is fantastic.