Make you awn arrangements.
When my wife (not a strong walker) and I waked the Camino Frances in 2009 we took 50 days. The best thing I have ever done. We had 3 'rest' days - in Burgos and Leon (sightseeing) and Ponferrada (illness).
<10 kms/day 3 days, 10-20 kms/day 27 days, >20 kms/day 17...