That is the same thing I'm running into. We have a really strict syllabus (lots of 1 hour local flights) and if we go somewhere outside of a 50nm radius, it makes the what is supposed to be allotted 1 hour of time go to 1.6 to 2.0, which then makes students go over on flight time, costing more $$$ and then leads to us flight instructors getting in trouble by the people above us. Also, to make things worse, our private/instrument trainer (and what we use for 75% of the commercial course) is a two seat plane, so backseating a student while one flies out 50 miles and switching out isn't an option.