That should give a rise time of around 100 samples. In most reasonable cases, that will be 1-10 seconds, depending on the sample rate. The fastest we can reasonably run this module is 250Hz, as limited by the accelerometer sampling rate. But if the sampling rate is that high, it's because the user is inspecting the high frequencies. In order to inspect low frequencies, I would expect the user to use a slower sampling rate, maybe around 50-100ms. 

Ideally, a proper HPF would be implemented, and that as well as providing a nice sharp cutoff at the desired frequency would reduce the number of frequency output instances in order to save RAM.