And up is down, and down is up...
What are you talking about?
Writing an affirm would take very little time indeed.
On the other hand, writing a judgement that sends back to Lamberth will take a while on a bunch of fronts. First, the judges have to discuss to the point where 2 or 3 come to agreement. Takes a while on some obscure issues.
Then grinding through some difficult legal issues to write a clear and productive judgement, disposing of some wrong headed lines of reasoning from government, giving careful directions to Lamberth so he cannot royally mess things up again.
...take a while to get a judgement sending back or reversing.