That's probably not an off flavor. What hops did you use to flavor?
DIPAs are supposed to have an insanely intense hop flavor. I tasted a grip of them at the homebrew meeting on sunday and it was quite an experience (I'm bringing water with me from now on, my palate was beyond blown out otherwise). Considering that "most people" have never drank a highly hopped beer in their life, the time to appreciation might be never.
I've read that the aromatic oils in hops starts to break down after about 2 years. If you're asking how long your DIPAs should age, I think most of the homebrews I tried this weekend were a couple or three months old.
Give it 3 months. At a certain point, the residual chlorophyll in the hops can gang up on you. Particularly if the hops weren't stored well. This can be a big problem in fresh hop ales, which is why they tend to be at the low end of the IPA scale.
My first brew was a 100% ahtanum pale ale around 40 IBUs. Tasted like a freshly mowed lawn at three weeks (I was impatient obviously). A month and a half later it was awesome.
I'm thinking of doing a double IPA soon to crack in November.