Ok, I found the path (droidfish/pgn) using ES File Explorer. This is another game.
My father's game against Droidfish
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I've drawn a few against Droidfish as well, without taking back moves. Most however are either short draws by repetion, or long draws by the 50-move rule. I do have one that falls outside those parameters and I will post it soon.
Droidfish on Moto G 2014 with 100% strength and one core (~30 vs. ~2 min passed until move 60). I don't know how many times he blundered and reversed the game though.
The game lasted a bit further (... 60. Qa2, Ba7) with some repetitive moves until my father said he was in advantage and there was no point in continuing the game.
He likes to play against Droidfish and he does it for fun. What I'd like to know is an estimete of his strength. Is it possible to guess his ELO from this game?