You will find conflicting information on this, but generally the long term use or high dosages of NSAIDs are not recommended in IBD patients. Some physicians will tell you that they should not be taken at all. That being said, my own surgeon prescribed a month supply of Celebrex, an NSAID, after my colectomy as I am allergic to codeine, which certainly limited what pain relief meds I could take post op. Luckily I didn't need to take it for more than a week; I found that once I was weaned off the morphine drip I didn't need much for pain relief other than plain Tylenol.
As to whether or not you should use NSAIDs, both my GI and surgeon have said that a couple of tablets of ibuprophen here or there for menstrual cramps or headache, for instance, are generally fine, but have cautioned against using it too much or too often. However, neither has ever told me not to take it outright. But considering their advice and general guidelines, I would think that 8 tablets per day for a month would probably be meandering into the riskier territory. You should know that there has been a correlation between NSAID use and the occurrence of pouchitis, as well as intestinal bleeding. NSAIDs can also exacerbate diarrhea and long term use/high doses can lead to kidney damage, which we may be at higher risk for as we are already more prone to dehydration that the average population.
The point is, I would check with your surgeon or GI first before you go on this regime. There may be other treatments that are more appropriate for you.