"Since it takes a long time to complete the game completely, I decided to speed up normal battles by 2.5 times with Scandinavian folk music playing in the background. Only battles with Bosses and Treasure Guardians take place at normal speed and with the original game sound. As a result, two complete playthroughs on difficulties 10 and 11 fit into less than 2 hours! I've met all of the game's bosses and almost all of the treasure guardians (except Rat King).
*Minor spoiler* - since leaderboard secret boss is more or less the re-skin of ordinary final boss, I didn`t count him.

Bosses:
12:29 - Awakened Golem.
31:28 - Dullahan (Headless).
44:04 - Horned Warden.
1:06:15 - Vran the Sullen.
1:28:22 - Derenheim Winterbane.
1:46:10 - Mistbearer.
Final Boss - 47:50 & 1:50:25.

Treasure Guardians:
10:35 - Soul Harvester.
26:11 - Perverted Lifeforce x5.
42:20 - The Preacher.
1:03:33 - Grotesque Nobleman.
1:20:41 - Giant Wyrm Serpent.
1:32:59 - Giant Werewolf."