well you need to figure out what your sequence settings are. hit apple zero on your timeline. is your sequence rendered before you try to export? and how are you exporting, same as source or doing a quicktime conversion. any of these things could be making your export time increase, but you need to figure out some small tech details first.
broadcast monitor means external, outside of the computer. necessary since computer screens display pixel sizes, colors and refresh rates different from a broadcast monitor.