When sampling in the Data logger mode, you can select the amount of samples per second that will be recorded. The slider lets you select different values up to 100 000 samples per second (100 kHz). You can also specify how long the sampling is supposed to last (forever by default).
After pressing Start, the sampling lasts to the moment the sampling time value is reached. If you specified the sampling to last forever, the sampling will last until you manually Stop it or until the Disk full trigger limit is reached.
Based on the chosen options, the Power Profiler application estimates the disk space usage.