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    <p>Here's a solution. The crux of the method is shown in the ExtractVidTimes method. The rest is just for creating the sample data</p> <pre><code> [TestFixture] public class TestyMcTest { public class Vid { public int CamId; public DateTime Start; public DateTime End; } [Test] public void Test() { var list = new List&lt;Vid&gt; { //=====Combination1======= new Vid { CamId = 1, Start = new DateTime(2000, 1, 1, 0, 0, 0), End = new DateTime(2000, 1, 1, 0, 3, 0) }, new Vid { CamId = 1, Start = new DateTime(2000, 1, 1, 0, 5, 0), End = new DateTime(2000, 1, 1, 0, 7, 0) }, //=====Combination2======= new Vid { CamId = 1, Start = new DateTime(2000, 1, 1, 0, 15, 0), End = new DateTime(2000, 1, 1, 0, 18, 0) }, //=====Combination3======= new Vid { CamId = 2, Start = new DateTime(2000, 1, 1, 0, 0, 0), End = new DateTime(2000, 1, 1, 0, 3, 0) }, //=====Combination4======= new Vid { CamId = 2, Start = new DateTime(2000, 1, 1, 0, 10, 0), End = new DateTime(2000, 1, 1, 0, 13, 0) } }; //here is your list of vids grouped by the cam id var result = ExtractVidTimes(list); } //THE METHOD private static List&lt;List&lt;Vid&gt;&gt; ExtractVidTimes(List&lt;Vid&gt; list) { //Group by cam ID var vidGroups = list.GroupBy(vid =&gt; vid.CamId).ToList(); //extract vids with aggregate times var result = vidGroups.Select(vids =&gt; { var vidTimes = new List&lt;Vid&gt;(); var finalVid = vids.OrderBy(vid=&gt; vid.Start).Aggregate((a, b) =&gt; { if (a.End.AddMinutes(5) &gt; b.Start) { a.End = b.End; return a; } vidTimes.Add(a); return b; }); vidTimes.Add(finalVid); return vidTimes; }).ToList(); //return result.SelectMany(x=&gt;x); //if you want a List&lt;vid&gt; return ed instead of a nested list return result; } } </code></pre>
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