Jimothy,
to answer your question, no the SO isn't burned up on long haul. For night flights the rest is usually split into 2 halves. If it is a day flight, usually split up into 4 bits...movie, movie, rest, rest ;-)
Someone else asked how are SOs treated. Mostly OK. I think on the 400 not as well as on the bus, but they may be a function of the age difference. Most -400 captains are probably late 40s, early 50s whereas on the bus there is a greater age range down to early 30s.
I am sure regretcx/cannot will post here to tell you how it 'truly' is in CX as I only know from flying with SOs for the last decade or so.