Someone can probably give a better answer, but it starts by him not paying.
He will appeal the result and that could easily take another year or so, during which time he doesn't pay.
Then he will just not pay, that will take some time since you can't complain to the courts that he didn't pay after 1 day, it probably takes at least 90 days, but realistically probably closer to 120 or 150 days so that he is REALLY overdue.
Then he is given a grace period to respond, that's another 30 to 60 days. He'll just say that he can't. That goes back and forth for a while, at least 6 months total.
Eventually the courts might put some sort of lien on Trump's income except he doesn't make money the traditional way, so it won't pay out. That takes another 6 months or so.
Then maybe they start going after assets. Assets aren't just free, so that takes even more time.
Also during all of this Trump moves assets around. He isn't allowed to, but he's already not allowed to and he has.
At some point in this process an agreement for a settlement is brought up. Trump will offer pennies on the dollar, which no one will accept. Trump will use this to bide even more time.
It's neverending legal maneuvering. Just bullshit on bullshit on bullshit. Eventually someone gives up or dies. It takes tens of tens of years. At any point Trump can just start to pay a little bit of it, then stop after a few months and the process starts again.
BTW if you don't pay your bills the full fury comes down on you. No baby gloves.