I have a 2016 CRV AWD. How often do I change my oil?

I recently bought a 2016 Honda CRV AWD for my wife for her work in January and it had 16.8k on it when I bought it. According to the design of the car, I'm supposed to change the oil when the service reminder (wrench) light goes off. My wife because of her work has 24.8k on it now. I feel like I really need to change the oil, but the dealer is saying to wait until the oil life on the dash is between 15 and 20 percent. The oil life on the dash is currently at 30 percent. This goes against all my car common sense maintenance instincts. How often should I change it or do I just listen to my dealership because they know the car?

My grandma's 2011 Honda CRV isn't TURNING ON?

I'm CLEANING HER CAR RIGHT NOW. I put my phone on the aux cord and let the music play while I was cleaning. The key was on second notch to let it play. After an hour or two I noticed the music stopped. I thought it was a timeout so i left it like that for about 20 min and turned to the second notch and the radio didn't come on but the gauge cluster lit up. I got a little more worried and i tried to turn the car on to test it and wouldnt turn on! I feel like I blew the battery? The engines and stuff is all good. I'm so scared. What do I do? I need help becore she finds out!