My guy is going on 2 and a half months without pooing. He hasn't passed any urates since then either. But let's some liquid go like once a week.
He's looking like he's getting ready to shed soon. So maybe he'll poo then.
But its not uncommon for bloods to go months without pooing. I'm not concerned with my guy. But if you are with yours. Try soaking. Or even fill a big tub with some warm water. And make him "swim" so to speak. Keep an eye on him for a few minutes. Should do the trick.
I believe kara said that somewhere.