I would like to firstly state that I do understand the essence of the reviewing process in scientific publications.
I have submitted my article to a material-science relating journal. The first round of revision was very fast; it took less than 10 days. One of two referees suggested a minor revision while the other asked for a moderate amount of questions.
Currently, it takes 3 weeks after two reviewers agreed to make the second round of reviewing.
Thus, is it common that the second (and later) reviewing process require more time as long as the first one?
P.S. Editor privately informed that they are same referees.