How should i program to make interval(period) measurements

[JBNUASEM]

HI,

I am not used to programming so i need all the help i can get. Currently i am using USB 6001 and i am using pressure guages linked to the USB 6001. i found the way to aquire mult channel analog inputs but i do not know how to record these data once every 30 minutes. I have plotted the program using LABVIEW VI in the DAQEXPRESS and I need some help programming the following.

1- how can i record the measurement of the signal once every 30 minutes? The measurement can keep on being done but i need only the measurement every 30 minutes because if i log all the data, it will be a too large file. it will be thankful if somebody could give me a plot of the program!