All orders, determinations and decisions made by the office shall be in force and effective 20 days after the same has been served as required by s. 227.48 unless the office shall specify a different date upon which the same shall be effective, and shall be prima facie lawful, and all regulations, practices and service prescribed by the office shall be in force and shall be prima facie lawful and reasonable, until finally found otherwise upon judicial review thereof instituted pursuant to ch. 227.