It's been a struggle for me to reach the 10 day mark between orgasms. I rarely use a chastity cage and have no keyholder, but the results have been impressive. More overall energy when exercising, ability to focus longer at work, and when the 5 day (or longer) mark is reached, women suddenly become much friendlier. Semen retention doesn't need to last forever, but training yourself into gradually longer periods of chastity (with or without a cage) is a smart idea. So - when you feel the sexual tension and frustration building in your chastity cage, and your lady refuses to unlock you, saying "it's for your own good" - - she's probably right! Please see vid below for more information on this subject.
Introduction to Tantric Semen Retention 101 - YouTube