I'll leave the IGT up to you, chief
VERIFIER NOTE:
The following are frame timed using somewes.com at 60 fps.
KELP FOREST
Start Time (New Game), End Time (Loading Triangle Appears)
Start Time 11.75, End Time: 3:21.067, Time: 3:09.317
+1:15 CHAPTER SELECT = 4:24.317
CORAL REEF
Start Time (Door Closed), End Time (Loading Triangle Appears)
Start Time 3:30.817, End Time: 9:36.033, Time: 6:05.217
OLD TEMPLE
Start Time (Door Closed), End Time (Loading Triangle Appears)
Start Time 9:48, End Time: 14:24.333, Time: 4:36.333
ABYSS RIFT
Start Time (Door Closed), End Time (Loading Triangle Appears)
Start Time 14:33.25, End Time: 20:23.133, Time: 5:49.883
FACTORY SHIP
Start Time (Door Closed), End Time (Loading Triangle Appears)
Start Time 20:29.85, End Time: 22:25.433, Time: 1:55.583
ATLANTIS CITY
Start Time (Diver Leaves Ground and Flipper Appears), End Time (Loading Triangle Appears)
Start Time 22:51.967, End Time: 29:37.417, Time: 6:45.45
PARADISE WATERS
Start Time (Diver Starts Swimming), End Time (End White Light)
Start Time 29:44.933, End Time: 34:18.783, Time: 4:33.85
LRT: 34 minutes, 10.633 seconds