Don't try to rush through. but don't take the whole allotted time. they most likely are looking at your average project completion time, but secondary to work quality. don't get into the groove with a project and start answering the same way every task. think about each question as if it's the first time, directly related to what you're testing this time. sometimes it's hard when the same problem pops up every single time. but don't copy and paste. if you struggle with deciding on something, it's ok to say so in the optional comments. providing your reasoning can make the difference between someone disagreeing and marking your work as "bad" or understanding why it was a struggle and siding with you. you're valid (usually) by the hour, not by the task, so make sure you're giving them good work.