I have a very large spreadsheet of dates and hours worked. I am trying to count the maximum number of consecutive days worked regardless of the hours worked in the day. The dates and hours are in a row rather than a column as exampled below.
Here is an example:

17 Feb 2013 8
18 Feb 2013 8
19 Feb 2013 10
20 Feb 2013
21 Feb 2013 11
22 Feb 2013 8
23 Feb 2013 9
24 Feb 2013 10
25 Feb 2013 7
26 Feb 2013 9
27 Feb 2013
28 Feb 2013
01 Mar 2013 8
02 Mar 2013 8
03 Mar 2013 9


= 6 consecutive days