There seems to be something amiss with the default speed function (set in my profile). I'm preparing for a 166 km Audax with a minimum speed of 9kph and a cutoff time of 18hr 25min. If I vary my default speed the duration on screen changes but is not correct, set to 9kph the duration is 23hr 16 mins (that time would be 7.1kph). At 15kph the duration shown is 13hr 58 min, it should be just over 11 hours. Setting my default speed to 11.4kph gets the duration shown on screen right.
In a downloaded TCX the time between the first and last trackpoints is always 11hr 20min, just over 14.6 kph. Should this be varying with my default setting?