3:50, set today, using full candidate lists (auto-updating), no pausing. Looks like I'd have to take 62 seconds off that to make the leaderboard though. If you could do it without using candidate lists, the times under 2 minutes might be possible without cheating; however, that would be difficult.
Several years ago I did have a flip phone with a sudoku game on it, and I could beat its hard setting in about the same amount of time as this, without candidate lists (it didn't have the capability), even though the input method was more analog, you had to scroll to each square.
If you're having trouble getting under 10 min, make sure you choose digit first so you can do candidate lists faster, and just go by number, starting with the numbers you already have the most of. The key is to use as few screentaps and to input them as fast as possible. I discovered that my time went down by more than 15 seconds on average when I stopped using a case on my phone so I could reach things a little more easily.
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