|Canto 10: The Summum Bonum||Chapter 3: The Birth of Lord Kṛṣṇa|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 10.3.36
evaḿ vāḿ tapyatos tīvraḿ
evam — in this way; vām — for both of you; tapyatoḥ — executing austerities; tīvram — very severe; tapaḥ — austerity; parama-duṣkaram — extremely difficult to execute; divya-varṣa — celestial years, or years counted according to the higher planetary system; sahasrāṇi — thousand; dvādaśa — twelve; īyuḥ — passed; mat-ātmanoḥ — simply engaged in consciousness of Me.
Thus you spent twelve thousand celestial years performing difficult activities of tapasya in consciousness of Me [Kṛṣṇa consciousness].
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness
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