Duration I have done yoga grouped by date.

Yogaglowduration.cs

var items = JsonConvert.DeserializeObject<PraticeHistory>(result);
	items.history.Select (h => new { WatchedDate =epoch.AddSeconds( h.date_watched_timestamp).ToLocalTime(),
	h.video.category, Duration = Convert.ToInt32( h.video.durationMin), h.video.level, h.video.short_description,
	h.video.style, h.video.title })
	.GroupBy (h => h.WatchedDate.ToShortDateString())
	.Select (h => new {h.Key, Duration = h.Select (x => x.Duration)})
	.Aggregate ((x,y) => x+y)} )
	.Dump();