I know what you are saying and this is going on all over the country. Last March three council workmen started making a bus stop just down the road from my house. They start at 8am but their supervisor starts at 9am so the first hour is spent chatting. They have a tea break from 10.30 to 11am and go for lunch 1pm to 2pm. They depart each evening at 4pm. They are a long way from finished. I reckon a private company would have the work done in a week. Just remember your €100 household charge will be spent on these type of projects.
A half hour coffee break and a 1 hour lunch break... pretty standard in most jobs that I've worked over the past 20 years. Do you follow them at 4pm to see if they are going home ? Perhaps they return to there depot to return equipment before finishing up their working day ?