If hormone treatment is used, it often works for some time, but no one knows whether it will be effective for one year or 10 years.
Likestyle changes, diet, exercises, and supplements are improtant as this can help the immune system, and reduce side effects of hormone treatment.
Take a look at the website www.yananow.net which has stories from men who have used various treatments including hormones for various times from months to 15 years. Look under mentors experiences.
Another site is www.clearfeed.com/pfeifer which has a protocol for advanced PC if hormone treatment is no longer effective.