The invention relates to a method for prolonging the serviceable life of the broad side walls of a mold, which is formed from broad side walls and narrow side walls, in a continuous casting installation for continuously casting a metal casting. In order to significantly prolong the serviceable life of a mold, in particular, for casting long sequences with the same casting width, the invention provides that a casting center axis is defined at the center between the narrow side walls, and the casting center axis continuously or discontinuously moves parallel to itself during casting.