I'd say 4 weeks, based on Montoya's ban
I don't think it's comparable with Montoya's ban. Montoya called a straight guy (as far as we know) a f****t. It's not really in the same stratosphere, IMO. A slur, nonetheless, but it's really not going to harm a straight person at all.
Calling an indigenous person a monkey is just so much worse. The way he said it - with all that aggression - he's cooked. He doubled down, acted like it was fun, went after him again, and then smirked his way through the airports like a Cheshire Cat.
The Roosters were complicit, IMO. A smart results drivien business, but scummy. That's why they win a lot, I guess. Other clubs probably would have done the same however I'm pretty sure that Spencer would have told them that he said it, and rather than have him own up and apologise, it seems like they waited for the clear evidence to show (slomo vision) to be seen before their ChatGPT apology. I could be wrong, but that's exactly how it looks.