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Good idea. Last time I ran round RP (11.6km the route I take) it was 1h15 as part of a 16km run. Yes, that's 6:27/km, I am that slow.
By the time I do the 35k run (6 weeks' time) I hope to be lighter, faster and fitter, and be pushing the pace a bit more anyway so I'll probably give myself a 3h45 cut off (1h10, 1h15, 1h20 not including 2 quick ~1 min stops to top up water bottle and grab another gel) and then walk once that time is up (hopefully I'll be done in that time).
Understood now, I'd read it as a session intended to smash your legs. Could perhaps have a "time on feet" target as well as 35km distance and finish at the first one you reach incase the extra 6km and hills make it a bit too big?