Once SBF gets arrested, the clock on trying him in court begins. The "clock" varies by jurisdiction; it can be a short as 30 days or as long as 6 months, and they have to gather all of the evidence they will be using before the trial begins.[1] Once the trial has concluded, he cannot be re-tried on the same or related charges even if new evidence comes to light.

Or IOW: prosecutors get one shot at the apple. They're going to wait until they have a good case and then they will prosecute him, assuming he hasn't been offed by then, and he will spend many years in prison.

[1] Defendants are usually asked to waive this deadline. For less serious charges, or for non-violent felonies where the defendant isn't planning to contest the charges, this is usually a good idea because prosecutors will agree to a better plea deal. For more serious and complex cases like this, it's never a good idea to waive the deadline. The defendant doesn't want to give the prosecution more time to prepare a case because the prosecutor won't agree to a better plea deal if they do. When defendants refuse to waive their right to a speedy trial, conviction rates are usually below 50% (from a standard rate of north of 80%) as the standard criminal investigation takes much longer than the speedy-trial window.