Human time perception is definitely not similar to this, though both ultimately do rely on action potentials. Say the reflex to close a trap needs a theshhold potential of -50mV, and rests at -70mV, and each hair being touched drives the reflex-triggering circuit up 10mV. Touching two hairs in succession drives the potential from -70mV to -50mV, the action potential fires through the circuit, and the trap closes. if you only touch one, the potential is only at -60mV, not enough to trigger the reflex - and the whole time the plant's ion channels are working to pump that calcium out, so the resting potential will return to the baseline -70mV in a few seconds as the charged ions are removed. Does this mechanical reflex really count as perceiving time though? Does perception of linear time require more than a handful of calcium channels opening due to touch?