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My best:
easy - 2:59
medium - 3:44
hard - 9:06
extreme - 9:47

all done honestly and non-stop.

I try not to use them on the easy and medium puzzles, takes too much time.
I usually use them on the hard ones and always on the extreme.

Given the puzzle provided I get this solution which is one of multiple solutions I can get.
681542379
235679481
794831652
568314927
479286135
312795864
953128746
846957213
127463598