Create a new log file every hour

I have a program which receives measurement data and writes this data to TDMS file. However, I want to create a new TDMS file every hour. When I put a while loop in mu sub vi which creates the new file the program doesn't run. I have attached the sub vi. Can anyone help me out here?
Cheers
Attachments:
ConfigTDMS (SubVI)_loopTDMS.vi ‏16 KB

One trick for doing this is to prepend the file name with YYJJJHH See example
Then just check if file exists (if not create and add headder) when you write to file.
This also generates the reports in "alphabetical" order so windows explorer presents them chronologically.
Jeff

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