Nice to see you are giving yourself off 4 weeks a year.
4 years for experience, sure, its possible in a controlled environment with consistent non-stop work. What about those 250 hours of classroom training? Maybe replace one of those 4 weeks of vacation a year and squeeze in those class hours over 4 years. Be sure to ask the wife-to-be if she is OK with your 'modest' salary for the next 4+ years. hahahaha
Check with your state, but PA allows 50% of experience hours to be residential when going for CG, or when upgrading from CR to CG they require 1,500 hours of commercial experience.
During my training, I sold real estate and insurance (property and casualty) to pay the bills while squeezing in appraisals. From day one till I passed the CR state test was 4.5 years. Mom scenario is more tempting, unfortunate she is 6 hours away.
Your answer will come after you figure out if the numbers are realistic and your potential employer can support your expectations, both training opportunities and assumed financial compensation fee splits.
I default back to -NewHavenMAI's reality check of "think about where you will be at 50"-. And remember too, just because you pass the state test and get your certification from the state doesn't mean the 'gravy train' of clients will be beating down your independent door. It's like getting a drivers license; you won't get to drive the Corvette just because you passed your drivers test. You get to drive the Civic for a couple years first. Clients want a 'seasoned' certification for their golf course/skyscraper/eminent domain appraisals, not a CG cert fresh off the printer.
Not trying to be a downer, just letting you know if it was that easy then way more people would be doing it.