Average/Expected Peer-Review Timetables
On average, how long must/should one wait for a decision after submitting an article for peer review? It has now been six months in my case, and while the editor has promised a swift reply multiple times, I am still waiting. Apparently there is one review pending. At what point would it be reasonable to retract the article to submit elsewhere? On the one hand, the journal has invested the editor's organizational efforts and one or more reviewers' time, and I respect and appreciate that. On the other hand, half a year seems an unreasonably long time to wait, given that the decision could still be "no." What are the norms for the major journals?