Muscle growth is difficult. (a) to attain; (b) to track. And, unless you happen to be male and young and have the proper genetics, it’s going to be slow.
Take the bench press. You bench 135 pounds right now (for olympic weights, that’s a 45 pound plate on each side, where the bar is 45 pounds. When do you think you’ll bench 185 (added 25 pounds per side)? If you’re young, male, and have the genetics, it might not take long, say a month. If you’re not young, male, and/or don’t have the genetics, it could easily take a year.