¿Cuántos minutos hay en la clase de español?
This translates to: How many minutes are there in the Spanish class?
Here's a breakdown of the corrections:
* ¿Cuántos? is the correct way to ask "how many" in Spanish.
* Hay means "there are" and is used in this context.
* En la clase de español means "in the Spanish class."
Let me know if you have any other questions!