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It is well known that design cost is only about 5% of final product cost, but over 70% of it is determined during design stage. Earlier in the product design and development cycle the design changes occur, more economic they become. Therefore, it is recommended that the manufacturing time and cost of product are considered in steps involved in designing and manufacturing a product as early as possible. In this study, it is proposed a possible way that can be available for estimating manufacturing time of parts, which are manufactured by conventional material removal processes (e.g. turning, milling, and drilling). For it to be useful in the early design stage, the minimum number of informations on dimension, shape, and design features of part will be used in this method.