Since you rated at 16 you will be safe with any of:

7, 9 or 10 minutes D-76 1:1 in small tank with typically recommended agitation (5 sec agitation each 30 seconds).

10 minutes is when I hit the "ASA triangle" which I believe got me full 32 speed.

7 minutes achieved lower contrast than I would have liked, but I believe now it gave me about 16 speed.