Earlier quoted context omitted.
> Longer school days, 3 meals, and a longer school year helps students stay focused. The middle one is absolutely true, the other two I really doubt e.g. in Finland or Germany, schoolday starts around 9AM and ends around 2PM, yielding 3h30 to 4h studies a day accounting for breaks, 5 days/week, with little homework (maybe 5h/week total). Afternoon is usually dedicated to clubs.
I believe it also depends on the environment around the school. In a third-world country, I'd probably prefer being safely indoors at school and in contact with friends, with free time if needed, than in a sketchy area without being able to see many friends. In a rich European country, there's enough public infrastructure (public transport, libraries, parks, etc.) that I'd probably prefer to be outside.
That's a ridiculous generalization. Most developing countries have lower crime rates than some American inner cities. Heck, many developing countries are safer than some developed countries.