I have submitted my paper to a reputed APS journal. It has been 65 days, and I still did not get any response. Should I contact the editor regarding this? I have two papers published in this journal and last two times it only took around 45-50 days. However, I am in a dilemma, if I contact the editor will he get mad at me. Hoping to hear useful thoughts from you.
As an author, I have had to wait anywhere from three days to seven months to get referee reports back from APS journals. The time lapse is highly variable, although two months is a typical time. I wouldn't even start to worry until it has been at least three or four months. The APS editors are also generally pretty good about letting authors know if there has been an extended delay (most commonly caused, I understand, by a difficultly in finding willing referees). If there's going to be a really long delay (over five or six months), they will probably send you an e-mail.
As a referee for the same journals, I can tell you that the editors like to hear back from referees within two weeks, but that doesn't necessarily mean the referee needs to submit a report within that time. Often, a potential referee will take the whole two weeks just to let the editor know that they are not available. And if they do promise a report, it may arrive another two to four weeks later.
In any case, if you are curious about the status of your article, you should consult APS's Author Status Inquiry System before contacting the editor. The system (located at https://authors.aps.org/Submissions/status/ ) provides automated information about the workflow status of your paper.
The average length time in review differs between journals but also depends quite a bit on the reviewers themselves. I once had one held up 4 months due to one reviewer, who was ultimately replaced, which then took another 2 months, and that was just the first round.
It is totally acceptable to contact the action editor to ask for a status update, and I don't think he/she will get 'mad'. It's probably common and part of their role to field such questions.
Reviews do often get held up; this will also serve as a reminder to the action editor to make sure everything is proceeding as it should.