I had not yet seen an estimate on game length for Dragon Age: Inquisition, so wanted to post this after I found it.

"If players push through side missions and cinematic sequences, Lee estimated the game will take somewhere between 40 and 50 hours. All-in, with the side missions, time for exploration and viewing of sequences, Lee said there will be well over 100 hours of gameplay." - Cameron Lee, in this article on wsj.com.