How much temp expansion do you get during when Jelqing,does this mean I'm doing right?

I’ve been doing jelqing on and off for a few years as you can see my account is old. But like most people I never stayed with it and I’d sometimes try to start again with always failing to keep with it. I decided to start PE again and I’ve been with it now for a few weeks.

When I’m doing a session warm up/stretch/jelq I can manage to get 0.25” temporary length/expansion. When I’m done my session I sometime get a myself to fully erection and I measure usually with 0.25” increased length. I know I shouldn’t measure as it adds extra stress on a person also it’s not like gains happen overnight, Which I don’t expect to happen. Does this temp change in size mean I’m doing it right? How long does it take before the penis make the gains its new permanent size, 2 or 3 months? I can never get any extra expansion girth wise the only way that’s possible is if I clamp, I can get a temp 0.25” in girth size.
Which I don’t really like doing. I would like to get bigger girth wise but I’m at 5.25” which seems to be bigger then most people when they start and if 0.5” or so takes awhile I’m fine with that. Also is 0.25” in expansion good when doing PE?

I apologize for my horrible grammar.