Competition laws are concerned about the integration of economic resources in the business that would result in a dominant position, with a focus on whether it would lead to a serious obstruction of effective market competition, or whether it may cause substantial loss reduction of competition. Fair Trade Commission (FTC) is mandated to regulate such integration. This study examines determinates of the number of days FTC spent on reviewing merger and acquisition applications using publicly available data. It funds that such regulatory factors as “conglomerate mergers,” “additional conditions or undertakings”, and “total market share” respectively have significant impacts on the "review period" of merger.