I have taken the IGT from the end of each course as appears on screen and calculated.

• Mari Circuit 01:58
• Magic Forest 01:53
• Human Village 02:24
• Scarlet Devil 02:31
• Lost Bamboo 02:15
• Yokai Mountain 02:26
• Seirensen 03:28
• Hakugyokuro 01:37
• Blazing Hell 02:54
• Misty Lake 02:33
• Old Capitol 02:37
• MariCircuit 2 01:42
• Outside World 02:21
• Voile Library 01:51
• Sea of Tranquility 02:26
• Moonlit Thicket 01:37
• City Depths 02:06
• Dev Area A 03:15
• Dev Area B 02:41
• Heaven 02:14
• Cirno Circuit 02:16