You'll have no problem making Roncesvalles in one day. My husband & I had booked accommodation ahead in Roncesvalles, I was nervous about crossing the mountain all in one day. I hardly slept a wink the night before,awake at 6am and was on the road @7am, picked up breakfast roll in cafe outside St Jean.Weather was dry,cold but sun was shining. At Orisson stopped for coffee where we met other pilgrims. Great atmosphere and friendliness among everyone. A few rain showers after Orisson and just when we were approx 2hrs away from Roncesvalles, rain,hail,thunder,lightning arrived and lasted for about 1hr (end May 2013)..........BUT the journey in one day was no problem at all,arriving so early in Orisson, I would have been bored hanging around there for the day especially as all the other pilgrims I met were doing the mountain in one day. I am 63 yrs old and my husband is 66!