How to shorten the Biofeedback Scan time? I narrow the frequency range in half, but it turns out there is not much change in time.

If you lower the range, but at the same time you raise the number of samples, then you don't get a time reduction.

Try a scan from 76000 to 95000 with a step size of 20, and then another scan from 95000 to 114000 with a step size of 25. With these step sizes, you won't get holes
Anyway, It is better to have a less accurate scan than not to have a scan at all.

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