To find out how long it will take you to finish the episode at 1.25x speed, you can use the formula:
\[ \text{Time} = \frac{\text{Original Duration}}{\text{Speed Factor}} \]
In this case, the original duration is 53 minutes and the speed factor is 1.25.
\[ \text{Time} = \frac{53 \text{ minutes}}{1.25} = 42.4 \text{ minutes} \]
So, it will take you approximately 42 minutes and 24 seconds to finish the episode at 1.25x speed.