Quick illustration: I googled Rose Bowl to Santa Monica (basically the beach) and the easy answer is 27 miles. However, I saw driving time estimates from 30 minutes to 2 hours. Reality is probably 45-50 minutes.
Traffic in LA can be crazy at times. Also, when they give directions in LA they tend to use an abbreviated form. Saturday Night Live actually did a skit about it years ago. For example: Going from Santa Monica to the Rose Bowl you might hear, "you take the 10 to 110 to Orange Grove". That's I-10 to US 110 to Orange Grove Blvd. Or they might just call Interstate 10 "Santa Monica". So that would be " you take Santa Monica to 110 to Orange Grove"