Indeed, but we can consider even shorter chunks of time than the last few seconds... Frequency itself is fundamentally dependent on time, e.g. The lowest 'A(0)

Indeed, but we can consider even shorter chunks of time than the last few seconds... Frequency itself is fundamentally dependent on time, e.g. The lowest 'A(0)' note on a piano vibrating at 27.5Hz = "cycles-per-second", up through "Concert Pitch" tuning reference 'A(4)' at 440Hz, and doubling in speed and pitch each octave upwards. I'm often similarly intrigued / amazed / bemused that without time, we'd have no concept of sound.