I've been in practice a few years now, and I said 2 weeks bc of your "wut" comment.
Someone with acute radic will present with weakness commonly, but the overwhelming majority of the time it resolves on its own bc it isn't real. You yourself mentioned the timeline.
That is why I don't consider that true weakness. It is a transient process that resolves with time.
I am very aware that an acute radic involves chemical neuritis, but it is short lived and if it doesn't hurt you shouldn't inject it.
Send them to PT and give them oral steroids.
I make it a point to never tell a patient anything about "inflammation" bc that is a buzz word in 2019. Physical therapists and chiropractors use that word all the time. Since you're so experienced and smart, I'm sure you know that.
Again I'll say to you, the overwhelming majority of the time the radic pt's weakness isn't real.
Painless weakness is an example of true weakness, which I mentioned a few times as an example of what I consider true weaknes assuming it doesn't resolve. Foot drop being the most common example.