Gran Turismo 5 boss Kazunori Yamauchi has confirmed that the ability to save a game mid-race is a feature currently being worked on by the dev team.
Yamauchi responded to a fan's problem about having to sit through 24 hour endurance races without having the time. Here's what he had to say:
"I'm sorry. Game saves during endurances. They are currently under development. RT @andrepeniche: as I simply don't have 4, 9 or even 24 hours available to stay in front of the TV to do endurance races, as much as I love GT5, unfortunately it's not possible for me to complete them."
Last Monday, Gran Turismo 5 was reported to have cleared 6.37 million copies. Kudos.