We apply a time assignment model system to estimate and analyse spatial differences in the values of work and leisure for segments of travellers who work in Santiago, Chile, a large, spatially segregated South American capital. The sample was obtained from the latest available Origin Destination Survey; it includes weekly time use and socio-economic characteristics, which represent the differences across zones. Seventeen segments are defined according to gender, age, family structure and zone of residence. Positive values of the marginal utility of work are obtained for women and youngsters, and negative for men and elders. Women without children showed larger values than mothers. Results are explained in terms of income hierarchy and committed time. [ABSTRACT FROM AUTHOR]