Carreers in UBA last longer than other (private) universities. 5 years + what we call the CBC or Ciclo Basico Comun which works as a filter, to make the level uniform, to standarize and homogeneize people that come from different high schools with different levels, etc.
There are 6 exams and take a year. You could give the exams and skip the year. After you approve you enter to the carrer itself.
So UBA carreers last minimum 6 years, two years more than private universities. What usually happens is as people study AND work here, they take their time, so they last like 10 years. Not everyone, but it happens a lot. Longer carreers like Medicine, is very common.
Those 2+ years, in general is what gives UBA some distinction, like a more complete and inclusive grounding.