I was told by my doctor that a fit person (age being the same) has no bering on treatment. I do know that the older you are the harder to treat so my doctor said.
The typical 'weekend warrior' who has NO Hep C (nor any irritants other than alcohol) will in all likelihood have little if any fibrosis. The interim 3-4 week days provide his liver w/the opportunity to rest, recover - and to repair itself.