Would it be possible to add an option for time in heart rate training zones to add to charts?
You can see that on the /totals page and for each activity on the activity HR page. Or do you mean somewhere else?
I would like to add it to the graphs on the fitness page. Would that be possible?
Currently it looks like you are able to add graphs of time in zones that are based on power with heart rate added when power is not available. I think it would be useful to have a graph that only displayed your time in heart rate zones or a combination of them e.g. Z1+2, Z3+4 and Z5+. This would line up well with Seiler’s polerised model.
Aha. I have added that to do the todo list. Not too hard 
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I have added these as well as time in each individual HR zone. For future workouts this only counts time for workout steps specified only with HR and not with power.
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I think there may be a bug with HR2 time in zone not displaying for future planned workouts on the fitness page. For example, I have added a workout to my calendar for the 6th of October that is mainly zone HR2 but it doesn’t appear on the fitness page. The activity appears to be registered on the fitness page as other metrics are influenced by it but not time in zone. Please could you let me know if I have set something up wrong or if this may be a bug?
That workout only has power for the steps so time in HR zones isn’t computed only time in power zones. Not quite sure what to do about that.
I have just changed that workout to be HR only and it still does not display on the HR time in zone graph. Please advise.
Other workouts that are power only display on heart rate time in zone graphs for zone 3 and higher. For example, please see workouts on the 13th and 20th of October. The workout on 13th October is “3h 75%” (only zone 2) and it does not display on the time in zone graphs but the 20th October is “3h 76%” (only zone 3) and it displays.
The same issue can be seen in the next two weeks for HR equivalent workouts. Duplicating the workouts from the 13th and 20th of October and adapting them to be just above and below boundaries for heat rate zone three. Time in zone graphs set up with fields of HR1, HR2, HR3+4 and HR5+ only display time in zone for the time spend in zone three and above.
Another example to try and debug this problem would be week 40 on my calendar:
For a graph setup like this:
The resulting graph can be seen at the top and the equivalent setup with power zones can be seen at the bottom graph:
There should be time in zone information for the heart rate workouts (in the first graph) and I think this should also be extended to display time in zones for all workouts as this would line up with the functionality of the power equivalent time in zones. This would allow future workouts to be planned based on power or heart rate and past workouts to be viewed in heart rate zones.