It took 67 days.
Custom software written from scratch
So the full random method? Which solves puzzle 67 in 67 days?
Full random yes.
I don't wan't to be disrespectful to anyone, but most of the theories I see here about patterns look crazy to me.
The ONLY way I could see a pattern between puzzles is if the creator messed up the randomess (unsecure RNG, predictable seed choice, etc...) and I really don't think he would make such a mistake.
Did you have plan a give a tip for @Wandering philosoper? He the guy research and publish how to avoid bots with maraslipstream.. I hope you did it.