A typical electrolysis session can be anywhere from 15 minutes to 2 hours. This will depend on the amount of hairs that need to be treated. You should expect to experience minor redness. There can be some swelling that occurs if the treatment duration is longer than a half hour. The swelling usually disappears after a few hours. One or two days later, minor scabbing can develop, and can take anywhere a week or two to heal. The scabs should then fall away without any permanent marks.