When will it become easier?
Never in the way you mean. Duty doesn't care about your feelings.
Kantian Deontology
Morality demands acting from duty regardless of inclination. Difficulty is irrelevant to categorical imperative. Seeking "easier" is suspect. Your question confuses happiness (pathological) with moral worth (rational).
Practical Lever
⚙
Act only on maxims you could will as universal law. Treat people as ends, never merely as means. Difficulty is morally neutral data.
Related Perspectives
Absurdism
accept
Never, and caring about this question is the error.
Similar mechanism: accept
Aristotelian Virtue Ethics
accept
When virtue becomes second nature through decades of practice.
Similar mechanism: accept
Advaita Vedanta
When you realize Atman equals Brahman (Self equals Absolute).
Contrasting perspective: internal
Anarchism (Kropotkin)
After spontaneous mutual aid abolishes coercive hierarchy.
Contrasting perspective: external
Derrida (Deconstruction)
The question presupposes metaphysics of presence that deconstruction dismantles.
Similar timeline: Immediate