But banning him from setting foot in the District of Columbia and talking about YEARS of prison time?
The banishment is part of his conditions of release and will expire whenever the criminal case is concluded. Nothing to see there. As far as "YEARS," well, the Federal Sentencing Guidelines don't have a specific section for this offense, so it falls under the other felony offenses section, which says that 18 U.S. Code 3553 is controlling.
Assuming he has no criminal record, my educated guess would be he stands a decent chance of doing no time. If he gets a prison sentence it will be 366 days, which is SOP is the Federal system because it gives the defendant a chance to earn early release. He'll also be required to forfeit the gyro-copter and any other property used in the commission of the offense, pay court costs, and possibly a fine.