I don't mind failing it if I fail it (I won't fail it). That's the point of making the whole thing the audax. Then again I reckon I'd just extend it to a 400 and do that. Ta
I'm sure there's no overdistance limit but I also think you don't get more time for the overdistance, so you have to do the 380 in 300 time. But that's not going to be an issue for you.
Yes, but there's not a lot of point. DIY the first 300 km in case you fall off / get hit by a car / lose interest at 302 km.