Is the race walker friendly?

Given the distance of the Havana Marathon racecourse (26.2 miles for the full marathon, 13.1 miles for the half marathon, and 6.2 miles for the 10k race), the Half Marathon and the 10k race has the higher odds for a walker friendly race. The course is open for five hours. If you can cover the marathon distance in the allotted time race walking, then you are allowed to do so.