You are here
evaṁ vāṁ tapyatos tīvraṁ
Word for word:
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].