Interesting idea, I don't think I've ever thought to run for a given time. Usually I just go out and back for a distance, or just run around until I don't feel like it anymore.
I went back through my strava history to find an activity close to an hour, and there was one from August, so that's pretty recent.
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Most of the run was on the hard sand at my local beach at low tide, which is where I do most of my running. It's pretty much perfect for barefoot running, so I'm quite lucky. There is a little bit of soft sand at the very end before you go across the bridge, and then a concrete path towards the bluff with a tiny gravel section that keeps me on my toes.
That's a pretty good effort running with smoky skies - I had a run last year on a day when there was some smoke about from a bushfire many kms away and I was noticeably struggling and ended up coming home early.
As an aside, I've actually been through Sparwood (which is unusual because I'm an Aussie who hasn't travelled all that much). Waaaaaaaaaaaaay back in 2005 we drove around BC and part of the route was from Waterton Lakes up to the Kootenay NP. My memory is a little foggy, but I remember stumbling across some lovely spots on that drive, Lundbreck Falls springs to mind. A really nice part of the world!