California CCW permits are at the whim of the local Sheriff or Chief of Police. Whatever agency is issuing your permit can provide you with a list of approved training classes. Ask for the list (our Sheriff puts it on his website) and call the instructor. They will tell you what course of fire to expect, if you have to "qualify" each gun, and what their requirements are to pass. They want you to pass - you are paying them, and if you fail, they fail.
Many don't require that you shoot what you are going to carry, nor do you have to score a certain score. You do, however, have to demonstrate safe handling of whatever firearm you use. The instructor I had was big on clearing drills. We'd have to jam an empty case in the slide and then clear it. My wife is taking the class next month (she just got approved) and she is nervous about having to do those drills, so she's taking a .22 revolver and a .38 revolver....
I would be very surprised if a timer was involved in any way on the course of fire. Many of the participants are elderly and/or disabled, and this is about self-defense, not law enforcement. Know the four safety rules and follow them to the letter. Don't rush, and don't try anything you feel unsafe doing, and you'll do fine. It's about gun safety, not gunslinging - slow is fine.
I do recommend electronic muffs, and use them beforehand if you aren't used to them. It's good to be able to hear what's going on around you.