I've been on my spring break this past week, which I primarily used to finish NieR Automata. Route B in one day (one sitting), the rest of the game the day after (again, single sitting).
The first half of the game (plot-wise) is honestly amazing, full of iconic moments and emotional scenes. I'll never forget Ending A.
I found the second half disappointing. HUGE, COMPLETE, GAME-RUINING SPOILERS FOR NIER AUTOMATA FOLLOW