Use only 1 team with 2-3 girls and >800 speed. If you're lucky with the loading, youwill have ~28 second left to start the 2nd round. And if you're still lucky and don't get too long loading, you will have ~2 second left for the 3rd round.
I do it 3 time only once but with the right girls (aka girls with 100 or 150 speed bonus) I think you can save some precious seconds.