Is 3–4 years from zero hours to a regional airline actually realistic, or am I being naive?

I'm 26, have the post 9/11 GI Bill and am planning on heading to a 2 year degree program for becoming a fixed wing pilot through a part 141 school paid for by the military. I am extremely motivated and committed to becoming an airline pilot and wanna know realistically how long would it take for me to achieve this? The school is 2 years and technically if I grind as a CFI could attain my r-atp license within a year. This is everything going right (which I know probably wont happen). I read all the time that it takes so many people 7+ years to become a pilot and I always wonder if this is because most people just don't commit to it full time or have the funding available. Would it be realistic for me to potentially get a job at a regional within 3-4 years being of full time working towards this goal? I guess mentally I just wanna know that if I commit to this I can probably be earning a decent living within 4 years vs something closer to a decade. I know there are a lot of unknowns and possible delays that could put me behind but I'm super motivated to try and achieve this.

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