You can post speculation on loading times here. I'll edit post with my findings

HELPFUL FOR TIMING Level WITH cutscenes : 1,3,5,8,9,11,13,17,19,20 (TESTED ON ANDROID) Levels WITHOUT Cutscenes: 2,4,6,7,10,12,14,15,16,18 (TESTED ON ANDROID)

How I timed PC: I used livesplit.started timer upon hitting hit level for those without cutscenes. I also started the timer when I skip cutscenes on those levels that do have them. I pause timer when leo spawns.

1m11s - PC Will time later, Seems on par with PC - Android Will time later, Significantly slower than PC - PS4

The loading times are based on many factors including platform architecture, processor speed, other apps running at the same time, amount of memory, etc... They are going to vary for everyone.