15 minutes, normal game speed (i always test on normal game speed to avoid stupid fractions like 12.5373 seconds to make 1 probe)
6 drones on 8 mineral stacks: 6224 minerals in 15 minutes
7 drones on 8 mineral stacks: 7232 minerals (+1008 increase)
8 drones on 8 mineral stacks: 8136 minerals (+904 increase)
9 drones on 8 mineral stacks: 8528 minerals (+392 increase)
10 drones on 8 mineral stacks: 8744 minerals (+216 increase)
11 drones on 8 mineral stacks: 8896 minerals (+152 increase)
12 drones on 8 mineral stacks: 9040 minerals (+144 increase)
a whole lotta work just to find out that you basically should only saturate 1 per patch xD