As long as the timer stays running and doesn't stop or pause at all until the run is done, there shouldn't be anything wrong with that.
I'd consult with mods about pausing the timer and pausing the game and coming back later to resume the run.
Like Spyro said, you're not allowed to pause the timer under any circumstance. Part of the challenge of doing 120 stars is doing it all in one sitting. If you can't do that then the consequence is losing a ton of time.
First of all, thank you to everyone who voted. This was the biggest turnout we've ever had, reaching 112 votes! Here is the final verdict: Co-Star (2P) runs will be split from No Co-Star (1P) runs for ALL categories, but Co-Star runs will appear first by default. We will not be implementing th