The numbers sound big (and they are) but a lot of it will be stuff that can be scanned out pretty quickly. He does not have to read and absorb every word, just understand which particular sets of records are being presented as evidence of criminality.
I do agree that he should be given enough time to prepare his case. He can stay in prison for as long as it takes. Had he not broken his bail conditions, he could do it from the comfort of his parents’ home. But he did, so he can’t.