made you a CheatSheet how to define the end of a correction based on time. If you are sure about the start of a wave/impulse you can very easy define a possible time "vector" for the end of the correction.
Start of the impulse = Zero Top of the impulse = 0.382
End of the correction at the common Fib numbers: 0.681/0.65; 0.89; 1; 1.272; 1.618 and so on.
If you combine it with a Fibonacci Retracement Tool (LogScale) you are able to define a price and time "vector" for a possible reversal or for the next impulse/wave.