Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 19
Sanskrit:
अयुतायुतवर्षाणां सहस्राणि शतानि च ।व्यतीयुर्भ्रमतस्तस्मिन् विष्णुमायावृतात्मन: ॥ १९ ॥
ITRANS:
ayutāyuta-varṣāṇāṁsahasrāṇi śatāni cavyatīyur bhramatas tasminviṣṇu-māyāvṛtātmanaḥ
Translation:
Countless millions of years passed as Mārkaṇḍeya wandered about in that deluge, his mind bewildered by the illusory energy of Lord Viṣṇu, the Supreme Personality of Godhead.