Rosie Swale Pope was supposed to have finished her journey on Friday
A grandmother from Pembrokeshire hopes she has sprinted into the record books after completing 27 marathons in 27 consecutive days.
Rosie Swale Pope, 63, ended her 707 mile (1,137km) charity journey in her home town of Tenby on Saturday.
Her final marathon was added at the last minute as a "lap of honour" paying tribute to those who had supported her.
She is now awaiting official confirmation that she is the first woman to have completed the feat.
She was greeted by cheering crowds as she crossed the finish line in Tudor Square, where she said she was happy but tired.
She said: "I think the main thing is to show people that they should reach out to do what they want to do.
"Maybe you can't always get there but you should always reach out.
"Although I am actually 63 doing something like this makes me feel as though I am really 36."
Mrs Swale Pope began running on Easter Monday in Tenby to raise money for children's hospices.
Throughout her marathon challenge, the grandmother has been pulling the three-wheeled cart called Icebird she used on an epic 20,000-mile global run that took her almost five years.
The cart held her provisions and camping equipment as she ran across Europe, Russia, Asia and north America.
As she had done during her round-the-world feat, she once again slept in her trusty cart during her latest challenge.
She was awarded the MBE for the global run, which she started in 2003, carried out in memory of her husband who had died of cancer.
Ms Swale Pope said she was motivated for her latest challenge around Wales and England by the "tragedy that children need hospices".
She said: "The main thing for me is to raise as much money as possible for children, I don't care about records.
"For me this underlines my belief that the real adventure is every day life.
The previous 26 days had seen her run in places including London, Bristol, Tunbridge Wells and Bury St Edmunds.
In each location her run has covered a pre-planned route to achieve the 26 miles and 385 yards needed to be classed as a marathon.
All money raised will go to the Ty Hafan Hospice in Cardiff and Helen & Douglas House Hospices in Oxfordshire.
The marathon trek itself was conceived as a thank-you to all those who supported her on the round-the-world run.