At the end of my targeted Audaxes this year, I got to do a 1002km 3-day Audax. This was in the UK and organised by the Kingston Wheelers → London – Anglesey – London Event Details| Audax UK - The Long Distance Cyclists' Association
I did finish and elected for the Full Value package, with 1/2 hour to spare in the 75 hours allocated.
We started 10pm on the Wednesday and rode through to Thursday evening for Night/Day1 . Then overnight stop in Machynlleth, Wales (367km). Day 2 around Anglesey and Snowdonia National Park (316km). Another overnight in Welshpool, Wales and then back on Day 3 (314km).
An interesting result is the power decrease over the 3 days. I rode conservatively always with the last day in mind (only having done a 600 over 2-days previously) and also the hilly Day 2. The power graph of each day shows a significant drop. I did have short but good sleeps overnight and ate very well.
Red is Day1, Light Blue Day2 and Dark Blue Day3
Day2 had a lot of climbs hence higher power up to 30mins
In the end I was struggling to hold above 20km/h despite a flat last 56km.
I’m currently on the Low Volume Grand Fondo Plan (3 sessions per week) and supplement that with 2-3 commutes per week.