Markets closed over the weekend. The market is in pre-open from 7am until 10am. Market closes around 4pm.
The futures exchange works around the clock with the foreign markets, as will Forex and commodity desks.
You may have to go into the office, but you won't be trading on a Saturday or Sunday. You will have to go in early before the market opens to put in orders for clients, and stay after the market closes.
Brokers and traders will usually work from 7am to 5pm/6pm five days a week.