Lunch time 12:00-2:00 pm: the Italians normally have lunch between 12:00 and 1:00 pm, a late one might be at 2:00 pm.
Lunch break 1:00-4:00 pm: the after-lunch break might last a few… HOURS and might include a pennichella (‘nap’)
“Happy hour” Aperitivo-time 6:00-9:00pm: not only drinks and cocktails but also a huge buffet.
Dinner time 7:00-….pm: Only the elder people or patients in a hospital have dinner before 7:oo pm. The rest of Italy eat dinner around 8:00 pm. In the summer you might want to enjoy the sun (maybe on the beach) untill 8:00 and have dinner at 9:30 or even 10:00 pm.
Business hours: Mon-Sat 9:00-1:oo pm and 4:00-8:00 pm. Sunday: ARE YOU KIDDING ME?
Working at night: Muahhahahaha!
Working during the weekend: MUahhahahahahhahahahahhahahahaaahha!