There were some kids who started to speak perfectly in 2 years. And then some who even 10 years later still struggle. And probably have mental problems due to it.
People who didn't have family here mostly interested with strangers, who all spoke English. They became fluent.
People who had family here spoke English only in context of school in limited sentences. They struggle even after college.
People who did worst were who had family here, and were only friends with people from their own country. Most didn't go to college.
People who were in ESL did worse than people in regular English. Mostly they had less opportunities to speak their native language and didn't learn bad grammar rules. Most grammar rules are broken at some point.
Learning to speak by reading is a crime in first place.
Doctor consoles patient. I've many consoles.
ESL student who learned from reading could die before realizing the distinction.