The GR 20 is about 180km long.
The walk for most people takes around 15 days. I’m hoping to finish in 8 or 9 nights.
It’s a busy track this late in June, alpine huts and hot meals available. The first few days, including the “Cirque de la Solitude”, are the most intensely scenic. Unfortunately that’s when my pack will be heaviest. 🙂
Sarkozy willin’ and the ferry don’t sink, I’ll start trekking Sunday afternoon, June 26th.
Rick McCharles 
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Fait attention a toi Rick. Profites bien – manges beaucoup des pain au chocolat et boire du bon cafe!!!
Ok, so my written Francais stinks! Take care, enjoy & eat a lot of chocolat croissants & drink good coffee!