This guy took 13 days cycling from Seville to Santiago after not having been on a bike for 40 years!!
http://www.viaplata.eu/
He says" I am a 61 year old, reasonably fit, male. Last time I was on a bicycle was 40 years ago as a student, so you could not call me an enthusiastic cyclist. After two weeks pedaling my way up (yes, everything is up when you are on a bike) the Via de la Plata, I was still 61, but an awful lot fitter."
Day 1 Sevilla - Torre de la Reina 25 km
Day 2 Torre de la Reina - El Real 72 km 962 m 6.3 hours
Day 3 El Real - Zafra 66 km 1166 m 6.2 hours
Day 4 Zafra - Mérida 80 km 497 m 5.0 hours
Day 5 Mérida - Caceres 71 km 511 m 5.1 hours
Day 6 Caceres - Plasencia 82 km 617 m 5.5 hours
Day 7 Plasencia - Bejar 100 km 1280 m 8.0 hours
Day 8 Bejar - Salamanca 70 km 1033 m 6.2 hours
Day 9 Salamanca - Zamora 50 km * 730 m 4.0 hours
Day 10 Zamora - Puebla de Sanabria 78 km 825 m 5.0 hours
Day 11 Peubla de Sanabria - Verin 94 km 1282 m 5.5 hours
Day 12 Verin - Ourense 75 km 946 m 5.0 hours
Day 13 Ourense - Santiago