I have data in following format
Date time doc no item
batch
(dd-mm-yyyy) (hh:mm:ss)

10-03-2009 15.33.24 1548526 abc aghdsa
10-03-2009 15.33.25 1548556 abc aghdsa
10-03-2009 15.33.25 1548556 xvd adddsa
10-03-2009 15.33.25 1548556 xyz wwhdsa
10-03-2009 15.33.25 1548556 def aghdjh
..
..
and so on for 24 hrs which is data of around 40 to 50K rows.

I need to segregate the data and know which time slot has max
activity.
Time slot can be 15 min.

In above example, doc no 1548556 should be counted only once.

Pl advise VBA approach or suitable formula for the same.

Regards,
Madiya