Works even on Open Office
Prior PBP, I spend what felt like decades poring over such a spreadsheet, tweaking average speeds between stages and targeted stopping times at every control. I liked it beforehand, but most of it turned out to be bollocks in reality
, as stuff like taking a wrong turn (yes, possible on PBP despite signs and GPS), having my gear cable replaced at Loudeac, running into a fantastic ride companion who I decided to stick with for big chunks of the ride tore up the whole schedule.
I still have a spreadsheet for LEL, but this time it's a bit simpler. I don't bother with predicting the lengths of the breaks at each control, but only the overall average speed I'm expecting to ride. I know that up to the first sleep stop, this hopefully will be around 20 kph, and then drop to around 14 kph for the remaining bit including sleep.