Base building now.  Waiting until I get a plan from Marlene.

          Workout Summary - media/20171104-1805300o.csv
--|Total|-Total-|--Avg--|-Avg-|Avg-|-Avg-|-Max-|-Avg
--|Dist-|-Time--|-Pace--|-Pwr-|SPM-|-HR--|-HR--|-DPS
--|19507|84:00.0|02:09.2|176.7|19.4|145.5|154.0|12.0
W-|19192|80:00.0|02:05.1|179.0|19.4|145.4|154.0|12.4
R-|00319|04:00.0|06:16.0|070.0|19.1|141.5|154.0|05.4
Workout Details
#-|SDist|-Split-|-SPace-|-Pwr-|SPM-|AvgHR|MaxHR|DPS-
00|04787|20:00.0|02:05.3|177.2|19.0|137.4|146.0|12.6
01|04776|20:00.0|02:05.6|176.8|19.0|145.5|151.0|12.6
02|04805|20:00.0|02:04.9|180.2|19.8|148.0|153.0|12.2
03|04825|20:00.0|02:04.4|181.8|20.0|150.9|154.0|12.1

That went very well. Initial power target was 175W, but 177 felt good.  I was under the HR limits at the end of 40 minutes so I decided to inch up the power a little.  Then a bit more in the last 20 minutes.  I felt relaxed and good through the session.