The Bronze challengers starts at 8.30am on Saturday morning.
You will leave Hathersage in the Hope valley past Hope and Bamford until you reach Castleton.
From here, you will join the limestone way past Peveril Castle and trek through the valley nature reserves of Hay Dale and Monks Dale.
Next you will join the Monsal trail at Millersdale and walk along a flat section along disused railway lines, through Victorian railway tunnels and get fantastic views of Monsal Dale on your way to picturesque Bakewell.
You pass through the estate and deer park of Chatsworth country house, from where you will rejoin the southern end of the Derwent Valley heritage trail, and follow the course of the river back north to Grindleford and home to Hathersage.
Will you make it inside your 12 hour target?