| Clue | Source | Date |
|---|---|---|
| Lasting for an immeasurable time span | New York Times | 03 Dec 2023 |
| Interminable | ||
| Eternal | ||
| Of a long, long time | ||
| Eternal | ||
| Very long term | ||
| Lasting forever | ||
| Lasting a long time | ||
| Lasting a very long time | ||
| Lasting a long, long time | ||
| Long-lasting | ||
| Everlasting | ||
| Everlasting. |