All depends on the language of the court judgment. If it says "$10,000 as of date of dissolution of marriage, as adjusted by interest, dividends, gains and losses on said sum from the date of dissolution to the date of transfer", that is what should happen.

But if it simply says "$10,000" with no further specification, then he gets $10,000 as of whenever the transfer occurs, just as it says.

And it is, generally, the transfee's (recipient's) responsibility to get the legal paperwork (the "QDRO") done that is needed to implement the court's award. If he does not see to it that it gets done, it's his problem, not yours.

Also, there is generally no statute of limitation on the implementation of a court that directs you to transfer all or part of a retirement asset to your former spouse. But keep in mind that you don't "owe" him $10,000. Rather, I suspect, the impact and legal effect of the court order is that it simply awards him a portion of your 401(k) in the amount of $10,000, to be accomplished (as required be federal law) by a Qualified Domestic Relations Order to be subsequently prepared, signed by the judge, and submitted to the administrator of the 401(k) plan.

Bottom line: His problem. Not yours. Don't lose any sleep over this.