I've made a quick guide for 10 FC category ( b^_^)b

there is actually a faster routes: -Do You Like Waffles?(all diff) https://osu.ppy.sh/b/46461 And if you really good at the game : -Troublemaker(skystar diff) https://osu.ppy.sh/b/510510 are both faster by 2 seconds than Doin' It Well.

other diffs of troublemaker are the same lenght

Nope they aren't in game, cause spinner are actually not counted in the lenght on beatmap listing!

There quite a few maps that appears shorter that they are in reality cause of this, take for exemple this map: https://osu.ppy.sh/b/449848&m=0 Appear 0:27 on beatmap listing, Is really 0.30 in game cause of spinner.

Oh Ok I didn't know that