lei·sure 
(lēzhər, lĕzhər)
(lēzhər, lĕzhər)n.
Idiom: 1. Free time when one is not working or attending to other duties.
2. Relaxation or activities engaged in during such time: the pursuit of leisure.
at (one's) leisure
When one has free time; at one's convenience: I'll return the call at my leisure.
[Middle English, from Norman French leisour, from Old French leisir, to be permitted, from Latin licēre.]