पञ्चनिमेषाः काष्ठाः ॥ कZ_०२.२०.३२ ॥
pañcanimeṣāḥ kāṣṭhāḥ
Five nimeṣas constitute one kāṣṭhā (a minor unit of time).
It builds a stepwise conversion chain from small perceptible instants to larger standardized blocks used in scheduling and record-keeping.
1 kāṣṭhā = 5 nimeṣa.