I am glad you are enjoying lactation. I have fond memories of lactation. I attempted it a few years back. It takes patience to build up a supply of milk, but the more you extract the more you produce.
I had an electric double breast pump, so I could extract from both breasts at the same time. I used to extract twice a day, in the morning before, and in the afternoon after work. What I use to love, it was my time. I would close my bedroom door, get comfortable and extract for about 10 to 15 min (cant remember exact amount of time). I kinda loved how it felt when the breast pump cup created the suction and the way it pulled my nipple.
The amount of milk I produced, I would get each bottle about a quarter to half full. When i spoke with my doctor, she told me, if I were a nursing mom, i would have to had supplemented with formula. I was disappointed, maybe I never extracted enough times a day. I would love to adopt a baby some day, I would if possible and if my milk is of good enough quality.. breast feed the child.
I did notice my breasts rounded out nicely from the ordeal and for me these changes were permanent. I know for some women these changes are temporary.