add comment to -r option about default value
#17418
| Job | Run time |
|---|---|
| 4m 35s | |
| 2m 32s | |
| 10s | |
| 4m 28s | |
| 2m 50s | |
| 1m 22s | |
| 19s | |
| 26s | |
| 7s | |
| 3m 34s | |
| 7m 1s | |
| 7m 39s | |
| 7m 8s | |
| 6m 0s | |
| 6m 0s | |
| 7m 45s | |
| 6m 1s | |
| 9m 36s | |
| 13m 41s | |
| 12m 3s | |
| 18m 17s | |
| 2s | |
| 2h 1m 36s |