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Ah, that works.
But it's a bit odd. Let's you fill in certain fields but will disregard them (i.e. elevation... I just copied the value from a prior commute along a similar route, but it just ignores them).
It's probably easier to download a prior activity, change the dates and upload. Heh, maybe I should do that next time.
I won't got back and fill in gaps, but it's nice to be able to overwrite a broken activity with a manual one.
Go to the Strava website, on the top right hand of the page, there is a + button, select the add manual activity and you can enter the duration and distance, but not much else if memory serves.