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In this paper, we critically review how alternative theories treat the time profile of production processes. We address production and time in classics and in the von Neumann-Sraffa representation of production.  We then turn our analysis to mainstream production theories. Finally, we focus on two time-specific analyses of production, developed by Nicholas Georgescu-Roegen and Gordon Winston. Georgescu-Roegen’s flow-fund model deals with the relationship between production organization, scale and efficiency. Winston's analysis of production can be considered as a complement of the flow-fund model, because it combines the time-specific representation of the production process in the fund-flow model with the cost implications of time-specific and duration-specific prices of the productive services.