Hi Leena,
it took me 34 days to go from Saint Jean to Santiago.
First day : 8 km (to Orisson).
Last day : 5 km (Monte do Gozo to Santiago)
The other days between 18 and 33 km.
I could have made it in less days - but why hurry, when it is so nice to take your time.
Well, I did not have mayor "pilgrims' problems" like big blisters or inflammation of tendons - most of them, I have been told, arrive if you either have a bag too heavy for you, or if you have a rhythm too fast for your condition (or, for the blisters, if you do not put some cream on your feet like vaseline or other for hydratation).
Oh yes, I am female and 40.
So : take care to reduce bag weight. (mine was 6,5 kg without water and food!)
Take your time to find your walking rhythm.
Don't stress yourself - if ever, time is running away because you need a day or 2 of rest, simply say to yourself that taking a bus for some km is not the end of the world...
Enjoy!!!
Fatma