If I was doing it again (which I might) I'd give myself 3 days and if I was far enough through at the end of day 1 then do it in 2.
And on the third day, God created, the "sickie".
ah I get you. in that case try it in 2 and if needs be you can bail to the delights of Swindon or Didcot and get the train from there to cut the ride short.
@hippy started
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If I was doing it again (which I might) I'd give myself 3 days and if I was far enough through at the end of day 1 then do it in 2.