It seems to be relevant to lifetime, though not the dominant factor in most cases. There is an annoying shortage of actual data on this online though (the best

It seems to be relevant to lifetime, though not the dominant factor in most cases. There is an annoying shortage of actual data on this online though (the best actual experiment I can find is mythbusters where a 2-minute on-off cycle caused a failure in two weeks, which is obviously extreme but shows how rapid cycling can affect lifespan).