Measured from pressing GAME to crossing finish line of the final stage.
I did lose quite a bit of time because of the time between stages. I didn't do anything to interrupt those parts.
Without the exta time between stages, this run is probably competitive with MilkToast's run, as I outperformed that run on some tracks by quite a bit like on Stage 5 and 6, though I lagged behind a bit in others.
This was only my second time beating this game in one sitting so I'm pretty proud of this run. I know there's plenty of room to improve and if I come back to this one anytime soon, I may try FS-UAE instead of PUAE in RetroArch. I know I was pretty conservative toward the end of Stage 7 and I was a bit sloppier than I should have been on the earlier stages. Nerves were getting to me in the beginning of Stage 8, but that's one of the hardest stages I've ever seen in a racing game.
Fun fact: I actually scored so many points in this run that I reset the counter to zero in Stage 8, but that obviously doesn't matter much for a speedrun.