Companies that use elevators often need to update their elevator systems. Sometimes they need larger elevators to handle the number of people who go through the building, and sometimes they need to update their elevators to keep up with safety codes. Companies can call elevator parts suppliers to bring the necessary equipment that will replace the parts in the elevator or the entire system. If the entire elevator needs to be replaced, it could take form one day to a week or longer to get the elevators working properly. The elevator needs to be tested before anyone uses it to ensure it is safe.