The runs are RTA so the timer still runs as you take a break. There were talks of taking a break in the discord but I forget the timeframe of how long you have to go before break, maybe 16 hours. Breaking down into 1 hour blocks would make it stupid easy.

I posted on the discord but here as well. I could see there being one/two breaks for Intensity 30 100% .

There is no reliable way to keep track of all xp medals being picked up in game. In game defines 100% by completing all sidequests/levels. Catalogues and skill trees would require to do go through the 2nd post game set to get everything.

Change your language option on your switch to japanese then start the game.