About 12 years. I had a year off in 2000 and in planning what I might do, I seriously considered walking the Camino, but after a little research I decided that it was far too dangerous for me to walk alone - I would be too lonely and I might fall off a cliff and I had never walked such a long distance before and I would probably get lost many times along the way. Time passes. A friend of a friend asked if I was interested in walking the Camino someday, so in May 2011 we walked from Leon to Santiago, figuring the earlier parts were either too hard (Pyrenees) or too boring (meseta). I returned (alone) in October to walk the parts I had missed in the spring (and fell in love with the meseta), and I have walked the
Camino Frances end to end twice more, 500km of the Arles/Aragones, and this summer I walked 300km on the CF and 300km on the Haervejen (ancient trade route and a Camino to Santiago) in Denmark with a friend I met in Navarette in 2011, and I have been a hospitalera twice. I am making up for lost time.
PS. In 2000, instead of walking the 'unsafe' Camino, I cycled for two wonderful months in The Netherlands and on my last day, a motorbike swiped me and I fell and fractured my elbow. I still have occasional pain...and scars to show. But I have had no injuries and only a few small blisters after walking about 3600km on Caminos (and I am not a spring chicken or athletic).