“I have achieved my goal ... I am now able to race in the full-distance Ironman in April,” Mr Foster said.

“And that was all I wanted to do.”

The 48-year-old, who received his latest dose of radiation therapy for a brain tumour on Friday, crossed the finish line just over six hours

But the time is irrelevant.

Mr Foster is on a mission to raise $140,600 – $1000 for every mile of an Ironman – for the KIDS Foundation a health promotion charity and leader in childhood injury prevention and injury recovery.

“I tried to look after myself today. I knew all I had to do was finish,” he said.

The Port Macquarie man said he was blown away by the support he received as he ground out the 113km race.

“It really gives you that little edge that keeps you going,” Mr Foster said. “In the end it was just a long day in the office.”

And now the work really starts for Mr Foster.

He will train 15-hours-a-week between now and April in preparation for one of the most gruelling race’s on earth.

“I felt better and better as the race went on ,” he said. “And when I got to it I enjoyed the run. So, at the moment ,all is good.”

Mr Foster thanked everyone who had supported him on his journey so far.

But was quick to remind that this was only just the beginning.

“I am now very confident that I have what it takes to do the Ironman,” he said.-

“And in the process raise money for a very good cause.”

Mr Foster will return to Sydney in two months time to have a magnetic resonance imaging (MRI) scan to see if the radiation treatment was successful in destroying the brain tumour that has haunted him for the past decade.