What is the main reason for the problem, according to the man?

W: We’ve got to come up with a way to solve this problem! No one is getting all their work done during the work day.
We need to do some brainstorming to come up with a time-management solution for our office.
M: Well, what do you suggest? It’s not that we are all wasting a lot of time.(4)The fact is, we’re understaffed. People just have too much to do.
W: So you think we should hire some new people? That is one possible solution. What else could be the problem?
M: Maybe we do have some problems with time-management. If people were always on time to work, they might get more done in the morning before lunch.
W: That’s true. Also, maybe we could shorten the lunch break from one hour to forty-five minutes. That would add a little time to everyone’s day.
M: Fifteen minutes would be good,(5)but I wonder if it would make a big impact on the employees’ output. I still think it’s a problem with too much workload.
W: We ended up right where we started.(6)Maybe it is time to look for some temp workers to help with a few projects. That would lighten everyone’s load.