Is it normal to do chin filler with only one injection site?

Is it improper to do 1cc of chin filler using only one injection site in the middle base of the chin? In 2 minutes total, my doctor inserted all of the 1cc in that one injection site and merely angled his needle to the left and right to finish it off. Was what he did dangerous or improper by usual standards? For reference, my previous chin filler done by a different doctor took ~30 minutes with multiple injection sites.