They have to decide whether to retry him within ten days, but most legal people I've spoken with think it's unlikely that they'll do so, one holdout juror or not. Having already gotten a conviction on eight counts the risk/reward is skewed pretty heavily against the prosecution at this point. Sentencing guidelines here in the States are sufficiently up to the discretion of the court that the number of counts you're convicted on means shockingly little for how much time you actually serve, and what they've got him already is likely enough for him to either spend the rest of his life in prison or decide to cooperate in Mueller's larger probe. On the other hand, if they do retry the prosecution is exposed to quite a bit of downside risk in that the defense gets to have another crack at your witnesses, your evidence, and it's possible new avenues open up for appeal of the first case. I think it's pretty likely that they just move on to the larger case in Virginia.
If anyone is sufficiently a masochist about this sort of thing I really highly recommend this weekly podcast which is covering all this. Really interesting, and very entertaining given the subject matter.
https://www.kcrw.com/news-culture/shows/lrc-presents-all-the-presidents-lawyers
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