The charts found on this page give some numbers…
| akaniṭṭha * | Highest | 16,000 kalpas |
|---|---|---|
| sudassi * | Clear-Sighted | 8,000 kalpas |
| sudassa * | Beautiful | 4,000 kalpas |
| atappa * | Untroubled | 2,000 kalpas |
| aviha * | Not Falling Away | 1,000 kalpas |
Sadly, the charts don’t give any citations on where this comes from.