CC Madhya 16.84

ei-mata mahāprabhura cāri vatsara gela
dakṣiṇa yāñā āsite dui vatsara lāgila
Synonyms: 
ei-mata — in this way; mahāprabhura — of Śrī Caitanya Mahāprabhu; cāri — four; vatsara — years; gela — passed; dakṣiṇa yāñā — after touring southern India; āsite — to come back; dui vatsara lāgila — He took two years.
Translation: 
Thus Śrī Caitanya Mahāprabhu passed four years. He spent the first two years on His tour in South India.