| Dudley Blauwet's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Staunton Rocks! Marathon & Half 2022 (Marathon) | Colorado, US | 68 | Saturday, August 27, 2022 | 06:48:24.00 |
| Quad Rock 2022 (Quad Rock 25) | Colorado, US | 68 | Saturday, May 7, 2022 | 06:29:03.00 |
| Quad Rock 2021 (Quad Rock 25) | Colorado, US | 67 | Saturday, May 8, 2021 | 06:15:27.00 |
| Quad Rock 2020 (Quad Rock 25) | Colorado, US | 66 | Saturday, August 15, 2020 | 06:17:39.00 |