The experts looked at the data. And what they found surprised them. The breadth of Hunter Bidens pardon was extraordinary, shielding him from the repercussions of all crimes, known and unknown, over a period of 10 years. No other pardon has been this broad, with the closest historic parallel was that of Nixon, whom was only pardoned for any crimes that occurred over a period of 4 years.
https://www.washingtonpost.com/politics/2024/12/02/hunter-biden-presidential-pardon-comparisons/
The extraordinary breadth of Hunter Biden’s pardon
President Joe Biden’s pardon of son Hunter for any offenses over a nearly 11-year period doesn’t have many, if any, direct historical parallels.

It’s one thing for a president to pardon his son. It’s another to do it like this.
President Joe Biden’s pardon of his son, Hunter Biden, on Sunday is exceptional not just because of the pardon’s recipient — the closest family member to receive a pardon in history — but also for its sheer breadth, according to experts on presidential pardons.

Biden didn’t just pardon his son for his convictions on tax and gun charges, but for any “offenses against the United States which he has committed or may have committed or taken part in during the period from January 1, 2014, through December 1, 2024.”
That’s a nearly 11-year period during which any federal crime Hunter Biden might have committed — and there are none we are aware of beyond what has already been adjudicated — can’t be prosecuted. It notably covers when he was appointed to the board of the Ukrainian energy company Burisma in 2014 all the way through Sunday, well after the crimes for which he was prosecuted.
Hunter Biden hasn’t been charged for his activities with regard to Burisma or anything beyond his convictions, and nothing in the public record suggests criminal charges could be around the bend.