It would be nice if you would divulge what YOU do for a living. Are you cabin crew? Flight crew? Cabin crew with another carrier? A wannabee who has been rejected by British Airways in the past and is therefore bitter about what we earn?
Of no real relevance but as you ask, 3 years as cabin crew and around 8 as flight crew.
Now let me see... Denver is around 10 hours flying time, so that will be about 2:30 each in the bunks then only 20 hours off before doing the same again back home.
Yup, seems horrendously gruelling to me.