Budgeting Time Optimally
Children spend 6 hours a day at school, 5 days a week, But 5 of those hours are lunch and recess breaks and there are losses for management and interruptions.
So, 10% of instructional time is about 2 hours a week.
That is 80 hours a year so, that would be 480 hours over 6 years.
This amount of time is very rarely available and would not be sufficient to provide mastery of Italian, even if it was.
However it it is enough for almost all students to gain fluency in Esperanto and to use it for several hundred hours worth of intercultural exploration.
There is something to be said for doing what you can, well.