All sounds good advice so far, as a first timer my question is how you all plan a strategy? where to stop? How do you split the ride up?
Any advice on this would be helpful.
Guess and be prepared to throw the plan away and have to come up with a completely new one (which may only last 200km, etc.)
Have you ridden a 600km ride? If so, how far in did you sleep? When did you start to feel (sleepy) tired? Did you finish comfortably in time or are you more of a full value rider?
If you've not done a 600km Audax, what's the longest ride you've done and how did you feel?
FWIW my initial plan for LEL 2009 was to cover the minimum required a day (24h * 12kph = 288km) and then sleep until I should be moving again.
This meant getting to the control at ~320km at the end of day 1 (the previous control wasn't far enough) and then eating/resting/sleeping until about 6am.
Day 2 ended up at a control about 620km. Again I set off early on Day 3, but the atrocious weather set in and slowed things (and most people) down.
I left the 800km control with 5 hours in hand and lost a small amount of time (thanks to a 1h emergency nap) by the time I got to the ~900km control.
I slept at the 900km control until I was on the time limit and then plodded on through the mildly hilly terrain.
My next sleep stop was at the 1100km control. I arrived with ~2 hours in hand but left slightly behind the time limits but knew I'd make it up by the next control as the weather was nice and I'd done all of the hills.
http://www.greenbank.org/misc/lel_time_in_hand.jpgAn afternoon start time makes it more interesting, on PBP 2011 I just rode straight through the first night after my 8pm start time (to get more time in hand) with the plan of having a bigger sleep at the end of night 2. It worked (kind of).
However, I'm lucky in that I can get by on 3h sleep a night during events like this (although spending 3 hours chatting to people at the 800km control on LEL 2009 would have been far better spent sleeping, I paid for that mistake shortly afterwards!)