Janiv Patel, from Woodford Green, completed his challenge on Saturday, August 30, and Sunday, August 31, by walking the length of the Piccadilly line.
Over the two days, he walked 109 kilometres (68 miles) in total, stopping at all 53 stations.
Janiv said the Piccadilly walk took him 29 hours and 19 minutes to complete.
Janiv said: “They were pillars of the family. They shared a house together and would host a big family gathering every couple of weeks.
“They were occasions we’d all look forward to. Everyone would come over, cook and eat together and catch up. It was a real joy.
“Until they passed away, I didn’t realise what an influence they’d had on me.
“Their values about community and helping other people have really informed my own.”
He said he completed each of the walks as a single event – with no sleep when walking the length of each line – and thinks it is a feat which hasn’t been done before.
Janiv added: “As with previous walks, I was the only person walking the full length, but friends and family joined for various sections.
“Seeing the support on the day, for previous events and on the donation page has been overwhelmingly incredible.
“Everybody has been extremely generous and supportive.”
He had to gain permission to access Heathrow Airport terminal 2/3, walking through a tunnel to get there.
Janiv has been raising the money for British Heart Foundation, beginning the challenge with the Central line in 2016.
On September 2, 2023, he completed the Bakerloo, Victoria, and Hammersmith and City lines consecutively in 27 hours and 11 minutes, stopping at 70 stations.
He continues to share his charity efforts on his Instagram and Facebook pages.
