How can I perform data logging for a specific time??

hello everyone,
I am quite new in labview and I have a basic question regarding data logging. Currently I am using a cRIO9074 and doing some data logging for my test. The data logging it self works ok so far.
But my problem is I would like to write my datas in a text file either for a specific time interval (ex)10 seconds) or for a specific amounts of data (ex)500 Samples). Can anyone give me some help regarding my problem?? Attached you can find my RT.vi 
I would appreciate for anyhelp!
Regards
Yun 
Attachments:
BP250 Encoder Position & Velocity (Host).vi ‏92 KB

Run your loggging program for that time. When your program terminates then it will write all the logged data so far in text file.
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--Ranjeet

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