There's some, but not many mistakes in this run. I'd say 1:18:30 is possible (but very difficult), and I think the absolute limit for this category would be a low 1:18 or a very high 1:17.

My splits.io best times for the SF Circuit races are messed up because I accidentally did them before the London Blitz's in one of my attempts. My sum of bests in reality is around a 1:17:35.