Idle time is limited to 5 seconds per track. You'd be playing 160 tracks, since you'd be playing each track 5 times. So yes, you can take a break as long as the total time does not exceed 800 seconds, or 13 minutes 20 seconds.

Hey, do you think it would be possible to make your Mario Kart Wii 100% Speedrun video on YouTube public instead of private? Thanks.