Thats for a single person testing the game. Not a team. A team should take significantly less time, even if they worked a single hour per day.
And this is not some rocket science, its an RPGM game lol. come on.
I have a full team, however, a full game takes longer. Most people don't have any idea of what it takes to develop a game or play test it.
-there are 30 girls;
-3000+ words for each that must be proofread;
-each girl has different abilities that must be tested individually, which means gridding them until max level;
-they must read all 64 hentai scenes and isolate the misspellings;
-They must test every girl in every city to see if their interactions are correct;
-they have their own personal life, and only have time during the weekends;
-They must search every map for game breaking bugs;
-They must test every feature of the game, which means each girl to see if everything is working for them. From gifts, to interactions and hentai scenes;
-They must test if the game is balanced, both combat-wise and item-wise around the maps of the game;
-They must suggest things that aren't obvious to the player, since I'm the developer, I might not be able to see them as not obvious, but might confuse a new player;
-I have to then correct every single of these mistakes and balance anything they found off
They are not just "playing" the game. Play testing is just not playing like an average player. It's playing with the intention of finding problems and reporting every mistake.