This is an improved version of my original run clocking in at 8 minutes and 1 second. A new personal best. I left all the relevent math below.
Run begins at 4 seconds Run ends at 16 Minutes 45 seconds
16 Minutes 45 seconds - 4 seconds = 16 Minutes 41 seconds Real Time
In-game time - 8 Minutes 01 (Game Time)
Total in-game Time (Per Level)
Tomb - 54 seconds (-2) Chinese - 50 seconds (+2) Cyberden - 50 seconds (+1) Village - 32 seconds (+1) Chemical Plant - 25 seconds (+2) Planet X - 54 seconds (+2) Mansion - Attempt 1 = 19 seconds| Attempt 2 = 6 seconds| Attempt 3 = 62 seconds| 19 + 6 + 62 = 87 seconds (-35) Docks - 65 seconds (+0) Spaceways - 64 seconds (-6)
Total Runtime
54 + 50 + 50 + 32 + 25 + 54 + 87 + 65 + 64 = 481 seconds (8 Minutes 01 Seconds)
Previous In-Game Runtime = 8 Minutes 38 Seconds New In-Game Runtime = 8 Minutes 01 Seconds (-37)
Real Time - 16 Minutes 41 seconds