Just because you can hold the 777 or 787 doesn’t necessarily mean you will become a top earner. The answer to the question, if you asked how long until you would a line holder, would probably be in excess of 10 years. Because until you are a line holder you will probably only achieve 76 hrs of pay a month. That’s reserve guarantee of 73 hrs plus 3 hrs for 5 unused short calls. FOs on other fleets can and do earn more than 76hrs x (wide body pay).