If you are not in the maze and already solving the first triangle puzzle when the final song starts then you likely won't have sufficient time to solve all the puzzles.
This can be amplified by the rising tension in the song as it crescendos and feels like it is building quickly to the end. Some people have noted that hearing Mountain King come on is really stress inducing. The first song lasts about 4-4.5 minutes while the second is about 2.5 minutes long ("In the Hall of the Mountain King"). As noted previously, there is a little less than 7 minutes total for the whole thing. There are some panels throughout the challenge that also denote time, but you will be able to hear approximately how much time you have left based on the songs. 2 classical pieces of music will play to denote time.You should be able to get there before the panel lights up. As soon as you move from the circle to the left side of the record player, you will have a few seconds to move to the first set of puzzles. The challenge starts with the record player.Now, here are some of the other mechanics of it all: This time, there are black and white squares you need to separate. Puzzle 14 - Rotating column with symmetrical lines.Additionally, there are squares/ dots on the path you need to pass through. Puzzle 13 - Rotating column with symmetrical lines.This final room has two puzzles in it you need to complete.