Purpose: The purpose of this paper was to test the mediating role of training duration in relationship between firm characteristics and training evaluation practices. In this paper, the authors also investigated if this mediating effect differs with respect to the size of the firm. Design/methodology/approach: The authors collected data from 260 professionals of 90 call centers. Findings: The authors found that training duration mediates the relationship between firm size and training evaluation. The authors also found that indirect effect of firm size on training evaluation through training duration differs across different levels of firm size but not across different levels of ownership. Research limitations/implications: This is a cross-sectional study that emphasized on training evaluation practices only. Practical implications: The study has implication for both evaluation researchers and practitioners in terms of designing training evaluation policies and practices. Originality/value: This is the first study in its nature that explains the intervening role of training duration in relationship of firm characteristics and training evaluation practices.