choose the car that you are most comfortable with doing laps subconsciously. Also, one that can be forgiving for the occasional input error, and also easy to get back on track if spun out, and to have a peace of mind to lead by a good 2 laps at least into the 11th hour,
For myself, this would be a Vaxhaul or opel Astra touring car, BMW GTR Racecar, Mclaren F1 racecar, 908FAP, Renault Trophy Lutencia racecar, Alpha 155 TI, to name a few.
If I had the time to sit this through, and a trusty wall circuit breaker, I'd do this every 24h I can get!