On what move would you have resigned?

Move 45

38, 39 and 40. In any of those.

I would have been seriously and progressively frustrated after moves 14, 23 and 27, but not quite enough to resign. Playing on mechanically just like White did I guess.

I wouldn't have resigned at all. After all, I'm black.

Actually black made quite a nice attempt at stalemate on move 58! I was impressed. But you're so much higher rated than me, I'm not sure if it impresses you people as much