This is a fantastic question captiangroove. Based on your photos, it appears that around 2000 to 2500 follicular grafts would be needed to optimally correct your current loss pattern. Unfortunately, in patients genetically predisposed to male patterned hair loss, they will continue to lose hair in the typical spots like your photos exhibit (the frontal/temples/top/vertex/crown) in a progressive manner over time. The only way to slow the rate of loss is through nonsurgical prescription (Propecia), over the counter (minoxidil) and injection therapy (PRP). Before undergoing any hair transplant, make sure that you're using 5% minoxidil foam twice daily over all affected areas, and if tolerated taking prescription Propecia which blocks the hormonal stimulus for hair loss, as directed by a physician. PRP scalp injection treatments are also potentially a good option for you. In this in-office awake procedure a blood sample is taken and the platelets and growth factors are isolated, concentrated and then injected into the scalp near the hair follicles to support and stimulate their growth. Several PRP injections separated by 6-8 weeks can slow and potentially reverse some hair loss. Again though, in patients genetically predisposed to hair loss, it is a progressive and inevitable process without hair transplantation to replace the lost follicles. The timing of hair transplantation should not have a significant effect on the future rate of loss in the areas of concern. Additionally, it is important to understand that the hair follicles transplanted are harvested from the lower rear portion of your hair-bearing scalp, which is a privileged area. The follicles in this area are special in that they are not sensitive to the hormonal cues that cause hair follicle loss on other parts of the head (this is why you'll rarely if ever see someone who is naturally bald on this part of the scalp unless they shave the area). After transplanting the follicles elsewhere on the scalp to replace the lost follicles, they maintain this hormone resistant quality and should be permanent. After transplant though, the native follicles in those areas will continue to be lost over time causing the appearance of progressive loss. This can be corrected however, with repeated transplant procedures. I always leave it up to my patients, but universally optimize the medical management of hair loss first. Afterwards, the patient and I decide whether to proceed immediately or in the future with transplantation. My preference usually though, is that staged smaller transplant procedures over time are superior to waiting until further hair loss occurs and then perform a much larger and more complicated procedure with a more dramatic before/after change. This approach gives a more gradual correction of the hair loss which patients often desire. The most important thing you can do now, is to find a local plastic surgeon that performs the Follicular Unit Extraction/Follicular Unit Transplant (FUE/FUT) procedure, and discuss in person with them how to best proceed. Best of luck!