Krishna explicitly advises in Gita that a devotee needs to be hard working. In Gita 6.1 Krishna says that a person who does his prescribed duties as required is actually in the renounced order of life and not the one who doesn’t do any work. And our work should not be whimsical. We should perform only those activities which satisfy the Lord because Krishna has said that work done as sacrifice to Vishnu should only be performed (Bhagavad Gita 3.9). So, a devotee of Krishna always tries his best to be productive at each and every moment of his life and he works in such a way which pleases Krishna and brings him closer to Krishna.
“The Supreme Personality of Godhead said: One who is unattached to the fruits of his work and who works as he is obligated is in the renounced order of life, and he is the true mystic, not he who lights no fire and performs no duty.” B.G. 6.1