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SB 3.11.24

svaṁ svaṁ kālaṁ manur bhuṅkte
 sādhikāṁ hy eka-saptatim
Synonyms: 
svam — own; svam — accordingly; kālam — duration of life; manuḥ — Manu; bhuṅkte — enjoys; sa-adhikām — a little more than; hi — certainly; eka-saptatim — seventy-one.
Translation: 
Each and every Manu enjoys a life of a little more than seventy-one sets of four millenniums.
Purport: 

The duration of life of a Manu comprises seventy-one sets of four millenniums, as described in the Viṣṇu Purāṇa. The duration of life of one Manu is about 852,000 years in the calculation of the demigods, or, in the calculation of human beings, 306,720,000 years.