Charles Bukowski - American author

I apologize if this subject has already been discussed here, but I couldn't find any information about this here or elsewhere on the internet. Over the years I've heard that Bukowski was allegedly sober for as long as a couple years at some point, possibly after the birth of his daughter Marina. Does anyone know if there is any truth to this, and what years this may have actually been? I'm aware that he quit drinking very late in his life, I'm not referring to those years. Any information would be appreciated.