She said she realised that after a slower-than-hoped start to the race, she would be lucky to complete the kayak leg before the time limit, but she had still given it everything.
"Of course I'm gutted, I would have loved to have finished but I did the best I could, I couldn't have pushed myself any harder or faster and I'm still just really proud that I gave it my best shot."
She said she lost time on the first run, which meant she missed out on being in a fast bike bunch and began the mountain run further back than she hoped and ran into difficulties on the kayak section.
Sandford said her next attempt at the Coast to Coast won't be for a few more years.
Other participants from the wider region had a better day though, with former Ohope resident Sophie Hart winning the women's Longest Day race title and Sam Clark, 22, of Whakatane taking out fourth in the men's race, behind winner Braden Currie, second placegetter and former Coast to Coast champion Richard Ussher, and Dougal Allan. He said after finishing he was "absolutely stuffed".
"My previous best [placing] was fifth and to go one better than that in a field like that, I'm pretty rapt," he said. "These guys are all a bit older than me, but I'll be back."
Steve Birkett, 45, of Whakatane, also competed in the Longest Day but withdrew on the kayak section, while Taupo accountant and former Ironman Mark Sinclair, 42, who competed the individual two-day event, was happy with his overall time of 15 hours 14 minutes.