What to do about prostatectomy, how long untill I can get an erection if the nerves were spared and why so long a recovery.?

Here are some ... What you referred to is radical prostatectomy (RP) for prostate cancer (P-Ca), which can be done with nerve-sparing techniques, but not always resulting in the outcome as commonly wished due to multiple intraoperative factors such as surgeon's proficiency and anatomical variations. As a result, inevitable direct or indirect injury to pudendal nerve & vessels may occur.