Answer
Household Life and Spiritual Practice: The Householder's Responsibilities and Nama Japa.
In the grihastha-ashrama (householder stage), there are numerous duties and responsibilities that must be fulfilled. In such circumstances, for those practitioners in whom the habit of continuous nama japa has been established, it is only natural that while the nama japa continues, their attention sometimes gets engaged in household or office work. This is not a matter of concern.
Focused Nama Japa Time
Nevertheless, two points require attention. The time for concentrated practice: Every day, one must set aside some time — half an hour, an hour — when the mind does not wander elsewhere during nama japa. This should be a time when you do not have household or office work to attend to. For instance, early morning when everyone is asleep, or at night when all tasks are finished, or after a meal when the house is quiet. Each person's time may differ, but the most suitable time is the early morning when the mind is fresh.
Techniques for Concentration
Perform japa with the Lord's image placed before you, fixing your gaze upon it. Or do japa alongside audio-guided meditation. Focus attention on the breath: as the breath goes out, chant "Rama"; as the breath comes in, chant "Rama." Gently turn the pupils toward the lower tip of the nose, as comfortably as you can. Padmasana is not required; japa can be done sitting on a chair or on the bed.
Through such practice, the wandering of the mind will come under control and the japa will become deep and profound.
The Importance and Limitations of Nama Japa
Nama japa holds great importance, but it is not the sole means of sadhana. It is one among many means. The Lord has clearly instructed householders in the Bhagavad Gita that all actions — whether household or professional — should be performed with the spirit of offering them to Ishvara.
The Message of the Gita: The Supremacy of Karma Yoga
The Lord has said that Karma Yoga is superior to sannyasa. Because: Sannyasis can meditate in solitude — they have no worldly responsibilities. But for the householder, solitary meditation is difficult. Therefore, the Lord instructed householders to dedicate all their actions to Ishvara.
Verse references:
"Ye tu sarvani karmani mayi sannyasya matparah | Ananyenaiva yogena mam dhyayanta upasate || 12.6 ||" "Teshamaham samuddharta mrityusamsarasagarat | Bhavami nachiratpartha mayyaveshitachetasam || 12.7 ||"
Those devotees who, surrendering all actions unto Me, worship Me with ananya yoga (exclusive devotion) and meditate on Me — I swiftly deliver them from the ocean of samsara (the cycle of birth and death).
For the Householder, Karma Itself Is Sadhana
If household and office duties are performed with the spirit of offering them to Ishvara, that very work becomes a great spiritual sadhana.
Verse references:
"Yatah pravrittir bhutanam yena sarvamidam tatam | Svakarmaṇa tamabhyarchya siddhim vindati manavah || 18.46 ||"
By worshipping through one's own duty that Supreme Being from whom all beings originate and by whom all this is pervaded, a person attains perfection.
"Sve sve karmanyabhiratah samsiddhim labhate narah | Svakarmaniratah siddhim yatha vindati tachhrinu || 18.45 ||"
A person engaged in their own duty with devotion attains the highest success.
"Muktasango'nahamvadi dhrityutsahasamanvitah | Siddhyasiddhyor nirvikarah karta sattvika uchyate || 18.26 ||"
The doer who is free from attachment and ego, endowed with steadfastness and enthusiasm, and unperturbed by success or failure — that doer is called sattvika.
Conclusion
If the householder performs all actions — whether domestic or professional — with the spirit of offering them to Ishvara, that itself becomes a profound sadhana. In this way, karma itself, serving as the instrument of yoga and sadhana, can become the path leading to moksha.