When does linda think the fighting and arguing between Willy and Biff will stop

Linda believes that when Willy matures and is finally able to hold down a job (not to mention that Biff needs to lower his expectations of perfection) the fighting between father and son will end.

Linda believes that if her sons become successful then Willy’s fragile psyche will heal itself. She expects her sons to manifest the corporate dreams of their father – not because she believes in Willy’s version of the American Dream, but because she believes her sons (Biff in particular) are the only hope for Willy’s sanity. She might have a point, by the way, because whenever Biff applies himself, Linda’s husband cheers up. His dark thoughts evaporate. These are the brief moments when Linda is finally happy instead of worrisome. But these moments don’t last long because Biff doesn’t fit into the “business world.”