Calculate difference between tow recors

I have table that contains below data

  CreatedDate               ID             Message
  2015-05-29 7:00:00      AOOze            abc
  2015-05-29 7:05:00      AOOze            start
  2015-05-29 7:10:00      AOOze            pqy
  2015-05-29 7:15:00      AOOze            lab
  2015-05-29 7:20:00      AOOze            lmn   
  2015-05-29 7:30:00      AOOze            start
  2015-05-29 7:35:00      AOOze            stop
  2015-05-29 7:40:00      AOOze            pqy
  2015-05-29 7:45:00      AOOze            stop
  2015-05-29 7:50:00      AOOze            lmn   

I need to Find Maximum interval time for between message like Start and Stop as per order of createdDate.
For example:

OccuranceCount       MinDate                    MaxDate          DurationInSeconds
1                 2015-05-29 7:05:00      2015-05-29 7:35:00   30
2                 2015-05-29 7:30:00      2015-05-29 7:45:00   15