I just got back from from an Australia cruise on the 14th and my casino offers just loaded on the 26th. so less than 2 weeks.
This was my first time logging any kind of real points on Carnival and the offers that I got were very good.
I think I finished with over 7000 points and all of my offers included Drinks on Us throughout the whole ship for just me. there was one offer that I will taking advantage of next week. The FDZ code will allow a 2025 booking and you can select any cabin rather than have it assigned. If you go above the interior cabin, it looks like you just pay the difference.
For comparison, I think my wife finished with around 4500 points and her DOU was casino only and went as high as a free ocean view on select sailings and the room is assigned at a later date.