For tiny SSDs, it's also important to consider how the volume of data written compares to the total capacity of the drive. Having the horizontal axis of the graph be time kinda implies the test could keep going indefinitely. But if the data were recast in terms of % of the drive, it would be easier to see how quickly it runs beyond any realistic use case: re-writing more than half the drive in one operation is simply not how people use their drives except on rare occasions (eg. restoring from backup).