SELECT Last 5 Days User Login Report

I have to select last 5 days login data from UserLog Table, Based on the LogMessage, Please find below example for clarity

Table : UserLog
Sample Data :
LogId | UserID | IP | DateTime | LogMessage
1 | 1012 | 102.34.23.xx | 2013-10-22 08:42:00 | User ID 1012 (Soft Token)[] - Primary authentication successful from RDS
2 | 1012 | 102.34.23.xx | 2013-10-22 08:43:00 | User ID 1012 (Soft Token)[] - Network Connect: Session started from RDS Location
3 | 1012 | 102.34.23.xx | 2013-10-22 08:45:00 | User ID 1012 (Soft Token)[] - Network Session Initiated: Success Session from RDS Location
4 | 1015 | 102.xx.203.xx | 2013-10-22 09:42:00 | User ID 1015 (Soft Token)[] - Primary authentication successful from RDS

[Code] ...

Expected Result:

I would like to select the user loged data by UserID for last 5 days, I will pass the UserID as a parameter, Time taken should be calculated based on LogMessage ( Time Between "Primary authentication successful" message and "Network Connect: Session started " Message), If multiple login for the same day We have to take the most recent one for the day.

Input : @UserID = 1012
UserID | Date | IP Address | TimeTaken (Min)
1012 | 2013-10-22 | 102.34.23.xx | 1
1012 | 2013-10-23 | 102.34.25.xx | 2