Power Finish dramatically increases ejaculation while intensifying orgasmic contractions leading to more intense pleasure. How long does it take to work? 30 to 45 minutes and it will last anywhere from four to six hours. After taking BioXgenic Power Finish Male Performance Capsules, the medication quickly enters your system and starts working after about Half an hour, but you can take it anywhere from 30 minutes to 40 minutes before sexual activity. Typically, an average erection may last from a few minutes to roughly half an hour. However, this can vary significantly due to the many factors that can affect erection duration. It is also worth noting that a person does not need an erection to achieve orgasm.