More than 60 years in the making, the Fire Island to Montauk Point beach reformulation project will have arrived and departed from Montauk’s downtown in barely the blink of an eye. The beach-infill component of the project began on Feb. 6 and was completed on Sunday, with around 475,000 cubic yards of sand pumped from an offshore site by a 480-foot suction-hopper dredge called the Ellis Island.