This may not really pertain to OP’s question but whatever.
My gains came very gradually. I did PE for a long time (I still do a bit here and there, but really focusing on strengthening EQ rather than size gains). I actually can’t even remember what my starting stats were, but if memory serves something like 5.5BPEL x 4.75EG (at 17 or 18). Today I am something like 6.8BPEL x 5.5EG (I am 29 now), which in actual fact is an achievement and testament to human commitment to goals. I must explain that I did not keep at it consistently and there were long stretches of months where nothing would be done. Although along the way, when I did actually start taking measurements, the ‘gaining’ itself felt almost like it wasn’t happening. Of course it was happening, the numbers don’t lie, but to my mind it never felt like it was.
My feeling is that I got into PE, as many men do, to right the perceived ‘wrong’ of nature; mother nature was apparently not aware that I was to have a large massive penis and thought that an average one would be more suitable. And of course that is entirely true - there is nothing wrong at all with an average penis. However, due to locker room bravado, porn and other media, one begins equating average with small. So this was my impetus to embark on methodical dick-pulling-squeezing routines.
When I realised that things were working, I’d go through periods of elation, then dejection. The problem was despite the statistics telling my I was now above average, the evidence with the measurements, the lack of any complaint from sexual partners (and compliments even!), I still felt I was ‘small’. It’s amazing what the human mind is capable of in terms of body image distortion. In some way, I somewhat understand how someone can become anorexic.
This made me feel a bit depressed on some level. So with every bit of gain came the same cycle: joy and then depression. At some point, I realised that penis size is actually secondary to the whole sexual act; the importance is on the communication, the romance/flirting, the interaction between two people. The impatience of youth giving away to a much more appreciative outlook on human relationships. It is as stupid as realising that everyone has hang ups about their bodies and only a really awful person would hold that against you.
I got into a good relationship but it has had its on and off moments. During the off ones, I’d find other people just for sex. I found that while my skills were good, the dick size amazed (at least some), I found the sex uninteresting and boring. I began to realise that the key to mind-blowing sex is actually a human connection, communication and trust. I think understanding that made me feel more satisfied with myself than the extra inch or so I added to both length and girth. I am happy to have the extra size, but I would trade it all to understand what I know now when I was 18, would have saved me a lot of anguish. I probably would engage in PE in some respect, but I don’t think I would have cared as much.
So the point is, I had felt a cycle of happiness and depression when I noted gains.