When I first started doing Audaxes I used to rest a couple of days before and after a ride.
Since I started having a large milkshake (for the protein) within an hour of finishing I've been feeling much less tired and lethargic on the following days and I've been happy to get back on the bike and cycle into work. That and making sure I avoid dehydration during the ride.
At the back of my mind I'm thinking about LEL: A flat 300km day. Hillier 300km day. Hilly 300km day. Hillyish 300km day. Flat 200km.
I've done 200+100 weekend, and a 300+100 weekend so far without problems.
Tour de France stages are much shorter than Audax though and those guys are much fitter than audax riders.
Not much shorter. 2008 is 21 stages totalling 3554km. Take out the 29km and 53km individual TTs you get 3472km in 19 stages, that's a 182km average.
Last year was 191km average (excluding TTs and prologue). 3 consecutive (albeit with one rest day) mountain stages of 197km, 196km and 218.5km.
They're just annoyingly fast. I think Lance has the fastest average at nearing 45kph over the whole thing.