Hey Kmoorthy, It looks like every x minutes where x is the time limit specified on the front panel you write some tables and text to an Excel report. One of the problems I see is that although you only write to the report every x minutes you are saving every time the loop iterates. In addition when the case structure is false you're not using the report reference for the report you've been writing to but another one.
It seems to me that what you're trying to do is create a separate Excel report every x minutes. In this case what I would suggest doing is moving the New Report VI in addition to the Save Report to File VI into the case statement. Make sure to also add the Dispose Report as suggested by Joe. I hope this helps! Sarah Miracle National Instruments
