Mel, you must admit this time, that your question is very personal and extremely subjective. Personal in the sense that pain levels and pain tolerance are very unique from person to person. Proper pain management is such a definitive science. Some here have needed virtually no pain meds not only from robotic, but even with some open surgeries. It's kind of like comparing hospital time, some more, some less.
With my open surgery, and having a natural low tolerance for pain, I needed pretty strong meds in the hospital. I was on prescription pain meds for about 3 weeks after the big surgery.
You should know how you deal with pain in general, and the rest, I hate to say it this way, you won't know till you are done. But if you need it, best advice I can give is to take what you need, you arent' going to become a pain pill junky in your recovery. You will heal better and faster if you are not addressing untreated pain issues. That's a medical fact.
I have had more chronic pain post salvage radiation then I did with my actual main surgery. Some of my corrective surgeries have left me with a great deal of pain too. The other thing is, make sure you communicate clearly with your medical staff on pain matters. Understand the pain scale chart, and always give honest estimates. There's no prize for taking less, or lying about how much you really hurt, unless you tell them, they won't have a definitive way of helping you.
David in SC
Age: 57, 56 dx, PSA: 7/07 5.8, 7/08 12.3, 9/08 14.5, 10/08 16.3
3rd Biopsy: 9/08 - 7/7 Positive, 40-90% Cancer, Gleason 4+3
Open RP: 11/08, Rht nerves saved, 4 days in hospt, on catheters for 63 days, 5th one out 1/09
Path Rpt: Gleason 3+4, pT2c, 42g, 20% cancer, 1 pos margin
Incontinence: 1 Month ED: Non issue at any point post surgery
Post Surgery PSA: 2/09 .05,5/09 .1, 6/09 .11. 8/09 .16
Post SRT PSA: 1/10 .12
Latest: 7/9 met 2 rad. oncl, 7/9 cath #6 - blockage, 8/9 2nd corr surgery, 8/9 cath #7 out 38 days, 9/9 - met 3rd rad. oncl., mapped 9/9, 10/1 - 3rd corr. surgery - SP cath/hard dialation, 10/5 - 11/27 IMRT SRT 39 sess/72 gys ,cath #8 33 days, Cath #9 35 days, 12/7 - Cath #10 43 days, 1/10 - Corrective Surgery #4, and Caths #11 and #12 in at the same time