Students attend school approximately 250 days of the year longest span any nation in what country?

There's no single country with the longest school year of approximately 250 days. School year lengths vary significantly by country, and even within countries based on factors like grade level and region. While some countries might have school years approaching 250 days, a definitive "longest" is difficult to pinpoint due to data inconsistencies and variations in how school days are counted (e.g., including half-days, excluding holidays, etc.).