It's less about tracking how long they're there and more about when they showed up. We do the former because we can, but the GC really wants to know if and when their subs are showing up without having to be on site 24/7 waiting for them.

For example, they can look back through yesterdays events to see that their plumber showed up - and then they'll know they need to go check on the work. The alternative is trying to get the plumber on the phone to figure out if the work had been completed or not - which is difficult in 2023.

There's not a lot of unioned workers in most states for residential construction. But autoworkers, and anything else in manufacturing would be used to the constant monitoring. Commercial construction also typically has fulltime site superintendents, who would do this anyway.