Stiftung Warentest, the German consumer testing foundation, grades washing machines also on how long they last. Three units of each model must each run 1,200 cycles in the lab, 600 washes at 90 degrees and 600 rinse-and-spin programs. Each machine is tested for eight months. The durability test makes up 20 percent of the overall grade. If a machine gets only ausreichend, sufficient, or mangelhaft, deficient, in the durability test, its overall grade cannot be better. In an earlier version of the test, each machine had to complete 1,840 washes, about ten years of use. In 2014 three of 13 models failed it and received the grade mangelhaft.