how much bleach to add is highly variable, depending on, well, everything!
more swimmer load=more chlorine
more aeration=more chlorine
more debris in pool= more chlorine
more wind/sun= more chlorine
more CYA = less chlorine (fooled you, didn't I!!!)

I use about 1.5 gallons in 3 days- full sun, temp 90, breezy, low swimmer load during week (wife a little during the day, me in the evenings with cold beer after work)... CYA 30-40 range... 26k gal pool, sand filter (filter shouldn't affect chlorine use, other than how much it is on stirring up water and causing more aeration...)