I'm placing this as a 8:48 because I think I hit the Mt. Wario split a tad bit too early.

Splits:

Sunshine Airport - 2:09.91 Dolphin Shoals - 4:20.61 (2:10.70) Electrodrome - 6:39.45 (2:18.84) Mt. Wario - 8:47.96 (2:08.51)