jefmcg
Guru
Yes, and you have a 27 hour time limit on that, not a 14 hour one.My 400k on Saturday 9th is prepped; bike checked and tested.
Kit bag ready except for clothing, which will depend upon the weather forecast.
I'll be commuting Tues-Thurs and taking it easier on Friday.
Assuming a proper stop for lunch, and the usual faffing (getting started, buying tickets at the end etc etc), I'd say that's going to be 12 hours at 18mph. That's a lot. I'm also doing a 400k on the weekend, I'll be averaging about half that.
Preparation - check everything on your bike. Test all the bolts are tight, brake pads are in good shape. If the tyres aren't new, consider replacing them and putting the current ones in the shed for later.