Thirty years
Expressions researched:
"20 to 30 years"
|"30 or 40 years"
|"30 years"
|"thirty year"
|"thirty years"
|"twenty to thirty years"
Srimad-Bhagavatam
SB Canto 7
SB 7.6.7, Purport:
Without Kṛṣṇa consciousness, one wastes twenty years in childhood and boyhood and another twenty years in old age, when one cannot perform any material activities and is full of anxiety about what is to be done by his sons and grandsons and how one's estate should be protected. Half of these years are spent in sleep. Furthermore, one wastes another thirty years sleeping at night during the rest of his life. Thus seventy out of one hundred years are wasted by a person who does not know the aim of life and how to utilize this human form.