|Madhya-līlā||Chapter 19: Lord Śrī Caitanya Mahāprabhu Instructs Śrīla Rūpa Gosvāmī|
Bhaktivedanta VedaBase: Śrī Caitanya Caritāmṛta Madhya 19.130
aṣṭa-prahara kṛṣṇa-bhajana, cāri daṇḍa śayane
nāma-sańkīrtane seha nahe kona dine
aṣṭa-prahara — twenty-four hours; kṛṣṇa-bhajana — worshiping Lord Kṛṣṇa; cāri daṇḍa — four daṇḍas (one daṇḍa equals twenty-four minutes); śayane — for sleeping; nāma-sańkīrtane — because of chanting the holy name of the Lord; seha — that much time; nahe — not; kona dine — some days.
"They engage almost twenty-four hours daily in rendering service to the Lord. They usually sleep only an hour and a half, and some days, when they continuously chant the Lord's holy name, they do not sleep at all.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness