摘要:In project planning, the process of determining optimum duration is an important step. This research was conducted on library building project of State Islamic Institute of Samarinda. The construction of this building demands acceleration due to the urgency of need, after experiencing 9 days delay on bore pile work. This study aimed to analyze the duration of required time acceleration by fast track work performance and analyze the total cost of the project after the fast track. This research was done by arranging material from related books and field survey results. The method of problem solving was Fast Track method. Based on the research results, it was known that the use of fast track method in the construction work of State Islamic Institute of Samarinda’s library building can save time as much as 9 working days from the total normal day of 60 working days or about 15 % of the implementation time. Implementation of fast track method to accelerate the construction of State Islamic Institute of Samarinda’s library building had enabled savings of Rp.27.300.000,00 from the total cost of the physical work implementation as much as Rp. 5.458.455.157,30. This amount is equal to 0.50 % of the overall cost. This acceleration of work did not increase the cost of physical work, and even can save indirect costs. However, to maximize the implementation of fast track method in the field, it required good management and qualified workers, as well as optimal control of the work implementation.