Delays in construction project implementation can affect project success, so effective time acceleration efforts are needed. This study aims to analyze the acceleration of construction time on the Kairagi Mas Office Building Construction Project in Manado using the Fast Track method. The research used a quantitative approach with secondary data consisting of the time schedule, S-curve, and bill of quantities (RAB). The critical path was determined using the Critical Path Method (CPM) with the assistance of Microsoft Project, and activities on the critical path were then rearranged to overlap, with a maximum acceleration limit of 50% of the predecessor activity's duration. The analysis showed that the critical path consists of the foundation work through the LMR structure work, with a duration of 540 days. Of the nine pairs of activities analyzed, six pairs could be fully accelerated, while three pairs had already reached the maximum acceleration limit. After applying Fast Track, the critical path duration was reduced to 285 days, a reduction of 255 days (47.2%), and the overall duration of the structural work decreased from 432 days to 285 days (147 days or 34.0%). It can be concluded that the Fast Track method is effective in accelerating construction project implementation without adding labor or materials.
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