You can't really tell how long his presidency lasts. Two term limit is just a rule that can be changed with help of judiciary branch. If Americans want him for a third term who'd object?
The mechanism is that Trump makes up the law, then it's sent to judges and they say "yup, this law is fine and just and in line with US law system".
> Justices told him to pound sand
He learned. Now he selects for loyalty alone.