On demo accounts, you will have access to real time quotes for the most traded Futures, Futures Options And Forex contracts for 30 days. But only some contracts can be traded on Demo accounts.
For PFG, click here to see the list of Demo tradeable products. Also, in the Quotes screen, if you browse contracts by clicking on Futures or Forex, you will see a category called "Tradeable in Demo" for quick access to Demo tradeable products.
On Real, Live Accounts, naturally you will be able to trade all the products that appear in the app, whenever their market is open.