There Is A Limit To Duty Day When It Involves   

And It's 14 hours, if there is any commercial flying that exceeds a 14 hour duty day. All company restraint must be released after 14 hours if it involves flying. Why wouldn't it? Under your plan, there would be no limit to how long you could fly past a 14 hour duty day, while under restraint for a company. Restraint would then be compliance with all company flight requirements, GOM, flight release, duty log, etc.