You are asking an abstract question, so here is an abstract answer. The most rudimentary LabVIEW A/D device, the NI USB-6009, can easily sample at 1KHz and pass data at that rate (without missing a single point) to LabVIEW, which can easily analyze data and "do something with it" (like spool it to disk, for example), again without missing a single point. If you want to write all of the points to Excel, you probably can't go at that high a rate, but if you want to write averages (say the average of a 1000 points, which comes out to 1 average per second), this is certainly within LabVIEW's capabilities.
Have you looked at the DAQmx Tutorials? In particular, have you seen the one with the title something like "Do 80% of your DAQmx Tasks with 10 DAQmx functions"? It shows you how to configure sampling without using Express VIs, so you actually control your device. Also, have you "played" with your acquisition device in MAX? Running it from MAX should certainly demonstrate its sampling capabilities.
BS
