User     Start Time               End Time            Desired Result (license count)

JW      03/24/2015 14:00:44      03/24/2015 14:09:57     -->    4
TT      03/24/2015 13:58:14      03/24/2015 14:21:08     -->    3
DQ      03/24/2015 13:53:10      03/24/2015 14:15:39     -->    3
BB      03/24/2015 13:50:55      03/24/2015 14:20:42     -->    2
BA      03/24/2015 13:43:02      03/24/2015 13:57:26     -->    2
JW      03/24/2015 13:40:30      03/24/2015 13:48:38     -->    1
BA      03/24/2015 13:18:26      03/24/2015 13:18:44     -->    1
BA      03/24/2015 13:15:18      03/24/2015 13:15:22     -->    1
CT      03/24/2015 11:56:55      03/24/2015 11:58:21     -->    1
CT      03/24/2015 11:53:23      03/24/2015 11:56:55     -->    1
CT      03/24/2015 11:51:50      03/24/2015 11:53:23     -->    1
CT      03/24/2015 11:48:11      03/24/2015 12:16:36     -->    1
CT      03/24/2015 11:36:54      03/24/2015 11:37:50     -->    1
CT      03/24/2015 11:33:52      03/24/2015 11:39:38     -->    1
CT      03/24/2015 11:31:25      03/24/2015 11:34:01     -->    1

=COUNTIFS(B2:B$16, "<="&C2, C2:C$16, ">="&B2, A2:A$16, "<>"&A2) + 1