I think (though you'd never know from the shit website etcetc) that if you didn't make it to the end of one stage in time for the cutoff, you got a number of penalty hours and were allowed to start the next day.
(nevermind, there was a comment here but I misread yours)
@kl started
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I think (though you'd never know from the shit website etcetc) that if you didn't make it to the end of one stage in time for the cutoff, you got a number of penalty hours and were allowed to start the next day.