If any of us knew how long, we would be clairvoyant. ED is filled with so many variables. How the surgery went, were the nerves damaged, what was your cindition priuor to surgery, what are your T-levels, etc.
I think some of it is also influenced by the pressure we put on ourselves to "get it on".
I would say just to relax little, be patient, and learn how to make love to yoiur wife without the wood, Make sure she is satisfied, and you may find it amazingly satisfying for you as well. It is different than pre-surgery, but it can be a good different.
Keep exercising Willie, a VED is a good device. You can have orgasm's without an erection to relieve some of your tension.
Wish we had magic answers, but we do have answers, just not the ones we all want to hear. At some point, you may decide to investigate injections if things don't move quickly enough for you.
Age 58, PSA 4.47 Biopsy - 2/12 cores , Gleason 4 + 5 = 9
Da Vinci, Cleveland Clinic 4/14/09 Nerves spared, but carved up a little.
0/23 lymph nodes involved pT3a NO MX
Catheter and 2 stints in ureters for 2 weeks .
Neg Margins, bladder neck negative
Living the Good Life, cancer free 6 week PSA <.03
3 month PSA <.01 (different lab)
5 month PSA <.03 (undetectable)
6 Month PSA <.01
1 pad a day, no progress on ED. Trimix injections