On the 17th of August I'm doing a 250 mile ride in the UK in one day. I'm no stranger to longer rides often completing 100 mile rides and my longest ever was 175 miles (it was fairly unpleasant towards the end).
I'm quite squeezed for time, so getting really long rides in prior to this event is difficult.
My question is, what's the most effective training possible over several shorter sessions (perhaps up to about 2hrs long) between now and then? I can probably just about get 8hrs of training in per week.
I quite enjoy doing really hard threshold intervals, and I've heard sweetspot training is highly effective, but I'm just not sure if that's better than sticking in zone 2 for this event?
Note: I feel strong enough to complete 250 miles now, but I want to make it as pain free as it can be. I have a power meter so I can train effectively, and I also have a turbo trainer and the trainerroad app.