If you are round Leeds tonight you will see my DH and about 20 men, standing around, doing nothing for 2 or 3 hours. There will be at least one motorway lane closed whilst they do so. It has been going on for a fortnight or so and has a week or so longer to go.
They are working, all of them. He and 3 others are monitoring various machines that you can't see. Another 2 are in contact with the people working those machines. 10 or more are waiting for my DH to give the thumbs up. Then they will do the hour's worth of work they have to do in order for your mobile phones, internet, cable telly and emergency services communications to work well.
You see the pre-work can take 30 minutes or 6 hours, depending on the ground they are boring through/shoring up. So they all have to wait, on stand-by, until the pre-work is finished.
They don't enjoy it any more than you do. They stand around, usually freezing, with no facilities or distractions (they are a sackable offence). They are officially on nights, but may get called to do a short day job at about 8 am. They are away from home for 7 days to get 7 hours worth of work done. They don't really enjoy it. But it does make your mobile work better!
Not all workers who are stood still are doing jack shit. Many of them are waiting for something that cannot be timetabled to be completed.
As you might be able to tell this is a regular topic of conversation here. DH is regularly abused by passers by. Last week a man in an enormous car was held up for about 5 minutes whilst a machine that bores holes was positioned. He got out of his car and berated my DH. He got his phone out and looked puzzled. "You are lucky there is no signal or I would have phoned your boss and told him you are doing fuck all" he shouted. DH replied, "When you do get a signal ring him and tell him I have finished repairing the mobile phone mast".