How get 48000 frames per second in PyAudio?

Question

I created stream

CHUNK=48000
RATE=48000
p = pa.PyAudio()

stream = p.open(
    rate=RATE,
    channels=CHANNELS,
    format=FORMAT,
    input=True,
    frames_per_buffer=CHUNK
)

And I take data from the buffer if the number of frames has reached 48000

def get_mic_data(s, num_frames):
while True:
    if s.get_read_available() > CHUNK:
        available = s.get_read_available()
        mic_data = np.frombuffer(s.read(num_frames, exception_on_overflow=False), dtype=np.int32)

        return mic_data, available
    else:
        time.sleep(0.1)

But this code doesn't give 48000 frames every second Sometimes 48,000 frames accumulate in 1.4 seconds, sometimes in 0.4 But I need 48000 frames per second