This article presents an adaptation of the labour supply model applied to the independent medical in which doctor's choice of the length of consultations is examined. A theoretical analysis is performed in an attempt to define the sets of constraints to which self-employed doctors are subject, and they show a marked difference in time-allocation behaviour according to whether medical care is provided under a fixed-fee scheme or under an unregulated-fees scheme, respectively “sector 1” and “sector 2” in France. The objective of this econometric study was to analyse time-allocation choices made by doctors in both sectors in France and to validate the theoretical prediction that doctors under unregulated-fees can make choices about the length of patient consultations independently of their personal leisure choices. According to our empirical results, doctors with unregulated-fees indeed show different behaviours regarding leisure-consumption choices and consultation length. The endogeneity of leisure choice to consultation length –verified in fixed-fee scheme- is no longer apparent under unregulated-fee. Our findings can be seen as a necessary, but insufficient, condition for legitimate unregulated fees in general practice.