More than 36,000 have so far registered a completion time following the virtual London Marathon, organisers have revealed.
The mass participation races were staged virtually this year due to the coronavirus pandemic, while elite athletes competed over a biosecure 1.3-mile looped course in St James's Park instead of the normal street route.
Mass race entrants were asked to complete a 26.2-mile course of their own choosing, including on treadmills and outdoors, and all finishers will receive a medal once their completion time has been sent to organisers.
The London Marathon said over 36,000 had so far logged their times prior to Sunday's (October 11) deadline.
"We are delighted and incredibly proud to have held this event during a worldwide pandemic," event director Hugh Brasher said.
"We have inspired tens of thousands of people around the world to take part in their own challenge, their own 26.2 miles, and to do it their way.
"The spirit of the London Marathon is about bringing people together.
"We couldn’t get them together in reality, but we have brought them together as a community.
"The individual stories and achievements have been incredible, and we believe the 40th race will live long in the memory.
"It truly has been a beacon of light in the darkness."
The virtual element of this year's Chicago Marathon, cancelled by organisers in July, began yesterday and also concludes on Sunday.
As well as the full marathon, shorter distances from the mile to the half marathon are also available for free to everyone to participate in.
"This week launches a new and unexpected chapter in the history of our event," said Chicago Marathon executive race director Carey Pinkowski.
"The Bank of America Chicago Marathon virtual experience offers an opportunity for everyone to take part in the run, but also give back and use our collective voice to cheer on others as they cross their own finish lines.
"The commitment and enthusiasm we've seen from the global running community is proof that the spirit of the event extends far beyond the streets of Chicago."