At my place, I see this all the time - kids spend forever on their homework and in the end everyone's frustrated. 2-3 hours daily in 9th grade is actually a lot. There are different recommendations out there: The KMK (Standing Conference of the Ministers of Education and Cultural Affairs) has guidelines saying it should be about 1.5 to 2 hours per day in lower secondary school - but that can vary depending on the state. Some states have more concrete requirements, others less so. Your parents aren't entirely off the mark if 2-3 hours regularly becomes the norm.
The problem is often: When teachers give out their homework individually, they don't always coordinate with each other. Then everything just happens to pile up on one day. It helps to bring this up calmly - either with your parents to the homeroom teacher or to the school administration. Some schools also have internal guidelines about what's realistic per day. If it really consistently stays at 2-3 hours, that should be looked into. That's not normal everywhere.