How do subs work

Do they have a limited time to improve u before reaching the maximum level (ceiling) , for example if I run ascension for 6 months will it improve me the maximum this sub can or will it continue to make changes if I listen to it for say 2 years, because how I see it with the sub, there is a limit to how much it can improve in you before u have to move on to a higher level sub or another sub, but I would love to know if I’m wrong @SaintSovereign @Fire @DarkPhilosopher.
Also what will happen if I listen to it and then come back after 2 years, will there be different changes made to me or will there be no effects since I hit my ceiling


I asked a similar question last year, and @Fire answered me: