If, when you created the DAQmx Task that is used in your VI Logger Task, you selected "N Samples" for the Acquisition Mode, then all N samples will be acquired by the DAQmx Task before returning the data to the VI Logger Task for logging and display. If you Select "Continuous" for the Acquisition Mode, then the DAQmx Task will return each sample to the VI Logger Task one at a time. This will show you a real-time display in the Real time Data window. I hope this information helps.
Have a great day,