The pet shop grooms dogs.  It takes 30 minutes to groom a poodle.  It takes half as much time to groom a terrier as it takes to groom a poodle.  They do not groom cats.  If the pet shop grooms 3 poodles and 8 terriers, what is the total length of time it will take, in minutes?
Please reason step by step, and put your final answer within \boxed{}.
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