Yes. You'll receive credit for however long you actually spent attending the live stream. Our class software tracks how long you actually spend in the class, starting when the instructor begins teaching. It doesn't rely on the scheduled times for the class to calculate your class attendance.
Note that the same is also true of the reverse situation: A live stream class that ends early will receive less seat time credit than the estimated run time, because credit is always based on your actual time spent attending the class.