Nobody reasonable ever told that reaching a level of 2xxx is simple for an adult "starter".
The first book review on amazon
www.amazon.com/Gm-Ram-Essential-Grandmaster-Chess-Knowledge/dp/0938650726 gives the core and Thomas Luther in his book on tactic training
www.schachversand.de/schach-taktik-training.html talks of 4-5 hours daily training! Luther knows something about empirical psychology, is GM, is experienced FIDE-Trainer.
As I got contact to two players here I will open a new topic about good training. Atm I have to manage health problems myself and in my family. But I wil start this somewhen this year.
The lack of empirical training knowledge is stunning. I would bet: A healthy adult with average IQ or better training daily at least 30 minutes and playing four tournaments with at least 30 tournament games (not blitz, not rapid) over all will win 100 Elo in two years if his rating is beyond 1500 with the right training.
A beginner in team matches in a club is mostly around 1200. In five to six years s/he will reach average club player level, which is 1500 when spending the time systematically.
Probably the learning curve is steeper at that level, but there is a lack of data. So I make a very reluctant prognosis. It is far beyond master level, but surely more interesting for most players here. And 2000 should be possible with peserveration. Then the first step to getting master begins.