How to get everything done without being rushed?

Brooke often talks about just getting things done in record time and not paying attention to the details.

My issue is that I set a time limit for a task, but then I always end up going over it. I try to not focus on the details, but sometimes things come up or I get stuck and need more time.

How do I either keep to the time limit or work faster? I hate the feeling of being rushed all the time.