Using the latest technology it is expected all the e mails can be screened in a few days. By the weekend they may have a conclusion. Now if they then find convincing evidence of criminality on Clinton,s part they may feel it necessary to make know the findings in the interest of National Security. They could hardly sit back and allow the electorate to elect a candidate under such circumstances. (as per previous posts)
Such a scenario would possible involve discussions with Clinton, giving her the option to withdraw or face disclosure of available information. If she withdrew she could claim health reasons to save face and Obama would likely give her a pardon, which would end the matter.
Her Vice Presidential pick would then move up to the plate, much too the abhorrence of Sanders supporters.
In any event the next 6 days will be very interesting.