My setup: I played on PC (keyboard) GOG edition using default settings. No external macros/hacks/cheats etc used. I recorded with OBS studio’s “window capture” feature.

Times:

Prehistory
00:12.8 to 01:33.2 (01:20,4)
01:46.9 to 03:33.9 (01:47,0)

Roman empire
04:06.7 to 06:15.2 (02:08,5)
06:32.0 to 08:37.5 (02:05,5 - Note: the timer stops at the first black fadeout frame!)

Jap. middle age
08:45.2 to 10:56.0 (02:10,8)
11:05.9 to 14:05.9 (03:00,0)

Euro. middle age
14:26.8 to 18:11.6 (03:44,8)
18:38.9 to 23:43.7 (05:04,8)

Conquistadors
24:27.5 to 26:48.2 (02:20,7)
27:02.8 to 31:48.5 (04:45,7)

Wild west
32:08.7 to 34:10.6 (02:01,9)
34:23.4 to 35:24.8 (01:01,4)

Modern wars
35:56.9 to 39:28.9 (03:32,0)
39:52.1 to 44:24.4 (04:32,3)

Future
44:47.5 to 48:28.0 (03:40,5)
49:27.3 to 53:35.6 (04:08,3)

Beyond time
53:53.2 to 54:07.9 (00:14,7)
54:32.6 to 56:04.4 (01:31,8 - Note: the timer starts at the "red bear" and stops at the "blue alien" area!)

Virus
56:31.4 to 57:42.8 (01:11,4)

Total: 50:22.5

Original OBS file: https://www.mediafire.com/file/7ca751sa8jk5cnn/2020-07-01+16-10-12.mkv/file