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Work out roughly how many kms a day you like to walk, divide that into 800, add in a couple of spares and go from there.
I would add in at least 5 extras days in case you get sick or injured. Always lots of interesting places to explore in Spain if you have extra time.Work out roughly how many kms a day you like to walk, divide that into 800, add in a couple of spares and go from there.
I'm not most people, so this is a different perspective that still might be of interest to some:
I had a one-way ticket, so I could be flexible about my return. BUT, when I got to the Iberian Airlines ticket counter in Chicago, they said their policy was that they would not let me on the plane without either a visa or a return flight. That's not the law, as I understand it, but it's their policy. I had to make a return flight standing at the counter. Not ideal!
Since Brexit it is theoretically possible for Spanish immigration officials to demand evidence of booked return or onward travel from we Brits before allowing us entry to the country. We can also be asked to provide documentary evidence that we possess at least 100 euros for every day of our intended stay and asked to provide proof of reserved accommodation for the entire journey. The latter would be a huge disincentive for those intending to walk the Caminos. In practice I have made several journeys to Spain in recent years without being asked for any of those things either by the airlines involved or government officials. There is some risk involved in travelling without a return flight booked but I think in reality for UK citizens being denied entry for not having return travel booked is very unlikely.