I submitted a paper to an applied-mathematics journal in May 2015, and the first round review took a bit more than seven months. I only received one referee report (there would usually be two), which was generally positive. I submitted the revised draft in mid January 2016, and it is “under review” ever since.
I inquired about the status about four months ago and only got a reply from the journal staff, basically saying that my message has been forwarded to the handling editor (nothing from the handling editor though). I am wondering if it is OK to inquire again? How long should I wait before I make an inquiry on a paper status (without being too pesty).
The journal states that its target processing time from submission to final publication is eight to nine months, and it typically gives reviewers two months.