respiration rate output

[blueskynot]

I am trying to derive the respiration rate using a sliding window but I do not know how to interpret the output. My array has size 60000 data points with freq=500 and I want to calculate a window of 10 sec and hop size=2000 (4 sec) using this command
rate = nk.rsp_rate(timeseries, peaks_dict, sampling_rate=freq, method='trough', window=10, hop_size=2000,peak_method='biosppy')
However the length of 'rate' is the same size as the input 'timeseries' array (N=60000) but I would expect the size to be equal to 28 from: num_windows = int((len(timeseries) - 5000) / 2000) + 1.

Am I using the command incorrectly?