This is true for most tests written by people inexperienced at making tests. A common mistake made by junior university faculty is to make a test way to long an

This is true for most tests written by people inexperienced at making tests. A common mistake made by junior university faculty is to make a test way to long and hard, having forgotten what it's like to be the test taker and making bad assumption like you say about how long it takes. Usually it gets better with experience.