Depending on the size of the drive that you are scanning, it can take a significant amount of time to scan partitions. Large or damaged drives can take multiple hours.
If you exit Active@ File Recovery in between a scan for any reason, it will take a long time to scan the partition again. To avoid losing the information that you have already scanned, you can save the SuperScan results to a file. When you open Active@ File Recovery again, opening the saved results file will ensure your SuperScan takes much less time.