Emphatically "No"! Contrary to popular belief it is never too late to medicinally treat gyno, as evidenced by numerous studies of severe, persistent, pubescent gyno which were completely resolved or at least satisfactorily reduced with therapy. Here are a studies that more clearly illustrate this point:
http://forums.steroid.com/showthread...=1#post3919943
As in your case gyno doesn’t have to be inherently painful, and yours was likely exposed by the large weight reduction. Although you may notice more fat loss in that region as your weight continues to decline, the "lumps" you cited are definitely gyno nodules and will consequently require active treatment. It's not a major concern that the etiology (cause) of this gyno is Idiopathic or unknown as you noted always having puffiness which may be genetic predisposition or pubertal gyno (depending on how far back you recall it), rec. drug use, supplements containing aas, etc., because it (etiology) is primarily used to determine the course or ordering of treatment, which can certainly vary based on the individual’s responsiveness.
Again, contrary to popular belief, there is no direct correlation as you presumed, between the amount time gyno is present and the time required for its resolution. The correlation is actually between the level of unbalanced hormone ratios within your body, and the time it takes to rectify this condition, or if the levels are re-stabilized the time it takes to effectively starve gyno of nourishing estrogen thereby shrinking it.
Bino's regimen varies depending on the factors involved, so you'll have to do the math. However, there are other effective alternative therapies which can be administered individually, simultaneously or sequentially (preferred) such as the less expensive/readily available Nolvadex, and even DHTs which can also be doctor prescribed and insurance covered, the most notable of which is Danazol. Here’s some more info:
Ting AC, Chow LW, Leung YF.
Comparison of tamoxifen with danazol in the management of idiopathic gynecomastia.
Am Surg 2000;66: 38-40.[ISI][Medline]
Parker LN, Gray DR, Lai MK, Levin ER.
Treatment of gynecomastia with tamoxifen: a double-blind crossover study. Metabolism. 1986;35: 705-8.[CrossRef][ISI][Medline]
McDermott MT, Hofeldt FD, Kidd GS.
Tamoxifen therapy for painful idiopathic gynecomastia.
South Med J 1990;83: 1283-5.[ISI][Medline]
Alagaratnam TT.
Idiopathic gynecomastia treated with tamoxifen: a preliminary report.
Clin Ther 1987;9: 483-7.[ISI][Medline]
Best to you.