How long for the body to get rid of dutasteride?

If I had side effects on dutasteride, would it take longer for them to go away after quitting use due to dutasteride’s long half-life?

Yes, most probably! We know the half life is in weeks (half life in the blood) but the half life in the body’s tissues are much longer (I don’t know those numbers) but it is suggested that it may take several months for your body’s tissues to get rid of dutasteride.