Recorded with obs 

Timer : LiveSplit 

On the video the timer stop at 1:18:47.98 with the manual in-time timer.

For the real time i used capcut to define more precisely the length of the run. I started at the frame before the screen starts getting dark when creating a new game ( 0:0:14.08 ) and I stopped it at the frame after the in-game timer stop at the last phase of Doremy Dream ( 1:19:01.22 ).

I decided to not use the rainbow mushroom because I found the oneshot debuff too frustrating and stressfull for an 80 minutes run. However I've still managed to no-hit most of the bosses that could be fight with that mushroom in this run so I'll probably try a few time to clear this game without being hit before leaving this speedrun but I greatly doubt I'll be able to do it.