A 38-year-old teacher from Guildford, near Surrey was the last man to finish the Ironman race, in Bolton, on August 1.
Dozens of spectators stayed out in Bolton town centre to give a strong welcome to Ted Jackson, who was competing in his first ever Ironman.
More than 1000 athletes took part in the gruelling challenge consisting of a 2.4 mile swim in Pennington Flash, in Leigh, a 112 mile bike ride in Lancashire, finishing with a 26.2 mile marathon in Bolton.
Athletes have a maximum of 17 hours to complete the race, with the cut-off point being 11pm. Ted Jackson completed the race at 10.42pm, with a time of 16 hours, 42 minutes and 43 seconds.
He said: "I'm done in, I'm lost for words. I only decided to do it on Thursday. I registered before but I wasn't going to do it because I haven't done any training! I'm not sporty but I like to do crazy things. I've done a marathon at the North Pole and did the entire Tour de France.
"I started the swim late and I only made the bike cut off by four minutes. The run was the most difficult bit but the people were brilliant, really helpful. I've never been to Bolton before but I thought it was fab. I won't do it again - unless I can qualify for Hawaii that is!"
Paul Frith, was the last Bolton athlete to complete the race, finishing around a minute before Mr Jackson, with a time of 16 hours, 41 minutes and 38 seconds.
Paul, a 37-year-old police trainer, lived in Bolton before he moved to Warrington seven years ago.
He said: "I feel great. I grew up here and went to school here. I'm really proud that I've done the Bolton Ironman. There's no words for it."
The race was organised by Ironman UK, with support from a number of partners including Bolton Council and the North West Regional Development Agency.