Is it possible in Garmin connect to obtain time spent in HR zones for a selection of date or duration (6 month/1 year) ? And, if possible, only for a selection of activities (example : running+cycling).
Given that Coros' software has this ability I would have thought that Garmin would have swooped in by now (especially given the publicity surrounding Kilians UTMB/Coros data!)
No, but https://www.runalyze.comis a free site that syncs with your Garmin Connect account and can display that information on a yearly or monthly basis.