I'll answer about where I teach, but I think it is similar in the rest of Italy. Typical amounts of teaching are:
- RTD-A 50-70 hours of frontal teaching / year
- RTD-B 70-100 hours
- Full and associate professor 120-130 hours.
In addition, exams take quite a lot of time. You have to offer the students up to 5-7 opportunities to take each exam each year (yes, you read that right), plus 2 make-up exams for certain protected categories such as parents and workers. Many undergraduate courses have a written and an oral exam, at least in the STEM area.
You have some leeway in scheduling your exams so that you can fit in conferences and/or visits, but typically lectures and exams will keep you busy for more or less the whole year, apart from August and a 2-weeks Christmas break. (Or you can arrange to have courses only in one semester, especially at the earlier career stages when you have less teaching.)
There are regular faculty meetings (at least 1/month). In addition, there are some committees for stuff like outreach, teaching evaluation, attracting new students; you can expect to have little administrative tasks at the beginning of your career but it will step up as you progress.
Paperwork is mostly tied to national and European grants.
EDIT to add more detail: As a professor, you won't have to sign a contract detailing your obligations: all the regulations come directly from the Italian codes of laws (yes, this is weird). In practice, there are very few hard requirements written in stone; one of them is the amount of teaching activities: as a professor, you can be required to cover at least 120 frontal teaching hours/academic year, and you have to devote to all teaching activities at least 350 hours/academic year overall. In practice, people usually talk to each other, compromise, and share the burden of department administrative activities. I don't know what would happen if someone decides to do the bare minimum and refuse all additional assignments, because in practice this doesn't happen.