If you count 11 as 2 instances, the digit 1 appears 18 times if you don't count 10, 19 times if you do.
10,11,12,13,14,15,16,17,18,19,21,31,41,51,61,71,81,91
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20
Infinite number of times;angels appear.
once
24
a lot At least 34 times.