I don't think they'll add real endurance races in GT6, because the "mini-endurances" already simulate the day-night-day transition. So, in a sense, adding real Endurances is saying that those other events "never existed" ? I don't know, I don't understand Kaz, I think that's what he would be thinking, and why he won't add real-time endurances.
The only two ways he could add them to GT6, I think, would be:
1- Adding an "E class", just under or above the "RedBullRacing X-Challenge". (but then again, it falls into the "mini-endurances" never existed *time paradox*" lol). The money prizes should be increased according to the time selected.
2- Add a slider to the current existing events, so we can select 12, 24, 60, 120 minutes, or 12 and 24 hours.
Personally, I'd prefer the latter to happen. An "E" class would just repeat the same events from "S" in a new page. The latter option would be somewhat of a game breaker though, as the events have already been gold'ed, and thus, we basically have no reason to go back.