I don't have lazy Sundays anymore, but when I did I was used to enjoy a really long slow jackoff session. Really just taking the time to appreciate myself and all the sensations. Sometimes looking at light porn and then looking away to focus on myself again.
Username does not check out btw. I found this pic very helpful.
I always try to do the same but then fail miserably when the light porn turns me on a bit too much. Now if I want longer jacking off sessions I usually go for dildos, at least I can focus on the pleasure without worrying about my session finishing abruptly.
Interesting. Unless I'm using monster dildos or chastity, I can't keep my hands off my cock and will shoot super quick with any butt toys. Everyone's different.