Since the jpouch is made with your own living tissue, small intestine, it will last your lifetime. However, since the surgery is relatively new there are no long term statistics on this. I do know people with jpouches that are 25+ years old and they are doing fine.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free