Did a tempo today in 31:34. I thought it was 6 miles - but it ended up being about 280 meters short. That is according to Google Maps, which doesn't account for elevation changes. My time for the first half (downhill) was 15:17 - the uphill half was 16:17. Part of the course is a mile stretch I have measured with a wheel - on that stretch I got 5:10 (ish) on the way down and 5:40 or so on the way up.
There was also busy stoplight about 1K from the finish that I had to stop at both times.
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