How long will this trip take?

Ok, im turning 14 on the 4th so on saturday (the 5th) my mom is taking me and a few friends up to l.a. to go to the ripley's believe it or not and the guitar center walk of fame. were probably gonna stop in the store for a bit too seeing as for an early present i got a guitar. so, what i wanna know is how long this whole trip will take. i know that hollywood is 45 min from my house, but approx how much time will i spend the whole day?