CC Madhya 10.41
anavasare kare prabhura śrī-aṅga-sevana
During Anavasara, after the Snāna-yātrā ceremony, Lord Jagannātha is absent from the temple for fifteen days so He can be renovated. This occurs annually. Janārdana, who is here being introduced to Śrī Caitanya Mahāprabhu, was rendering this service at the time. The renovation of Lord Jagannātha is also known as Nava-yauvana, which indicates that the Jagannātha Deity is being fully restored to youth.