Hi and welcome,
I am 22 months into learning the guitar and what Chrisopher has down is exactly how it has worked for me. There is a balancing act we all need to sort out for ourselves between learning the lesson(s) and getting bored and not progressing.
good luck with your studies.
"So, you should spend as much time on any given lesson as necessary to completely get the idea or skill under your command. But don't let a misguided idea of perfection discourage you or halt your progress. At the same time you should keep moving forward in the course, watching new lessons to keep things interesting. But keep going back over the older material until it's second nature. This is the constant process of refinement. You won't play a chord exactly right, perfectly every time!"
This year the diet is definitely gonna stick!