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SB 3.11.7

nimeṣas tri-lavo jñeya
 āmnātas te trayaḥ kṣaṇaḥ
kṣaṇān pañca viduḥ kāṣṭhāṁ
 laghu tā daśa pañca ca
Synonyms: 
nimeṣaḥ — the duration of time called a nimeṣa; tri-lavaḥ — the duration of three lavas; jñeyaḥ — is to be known; āmnātaḥ — it is so called; te — they; trayaḥ — three; kṣaṇaḥ — the duration of time called a kṣaṇa; kṣaṇān — such kṣaṇas; pañca — five; viduḥ — one should understand; kāṣṭhām — the duration of time called a kāṣṭhā; laghu — the duration of time called a laghu; tāḥ — those; daśa pañca — fifteen; ca — also.
Translation: 
The duration of time of three lavas is equal to one nimeṣa, the combination of three nimeṣas makes one kṣaṇa, five kṣaṇas combined together make one kāṣṭhā, and fifteen kāṣṭhās make one laghu.
Purport: 

By calculation it is found that one laghu is equal to two minutes. The atomic calculation of time in terms of Vedic wisdom may be converted into present time with this understanding.