Bhagavatapurana 5.22.16

5.22.16

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tata upariṣṭād yojana-lakṣa-dvayāt pratīyamānaḥ śanaiścara ekaikasmin rāśau triṃśan māsān vilambamānaḥ sarvān evānuparyeti tāvadbhir anuvatsaraiḥ prāyeṇa hi sarveṣām aśāntikaraḥ //

16. Still further above, at a distance of two lakhs of Yojanas appears Sanaischara (Saturn) he moves about each sign for a period of thirty months and in as many years he completes his circuit through all the twelve signs; and he is generally said to bode evil to all.