Mining donuts: What’s the highest you’ve found?

"LisaSimpsonLFC;c-2211755" wrote:
But do you only get to mining donuts 1 time from each of those rock things? If you know what i mean?

I've now observed that the lower level rocks allow two taps, while the higher levels offer only one. What I'm seeing is that in the lower levels, the items are double stacked and can be collected and stored that way. Selecting 5 items stores as ten. But this is only in the first two levels. From level 3+, the items are single. The rocks allow one tap for donuts.