Regarding the issue of nRF connect monitoring data

As shown in the above picture,
1. Choose 10000 beat times for monitoring. Why is there a significant difference between the pulse peak and the peak of selecting 100000 beats? Which one should be the correct one
2. Selecting 100000 beats for monitoring duration can only stop after 2 hours. Currently, my computer's memory is 24GB, and what other factors are related to memory
Thank you.

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