@Dubravka20 As Colleen says, you should read everything in the Help pages on the main site for hosts, so you understand how everything works.
You absolutely must reply to Inquiries and Requests with 24 hrs. Regardless of your settings, inquiries are just a way for guests to ask questions - they can ask you to cook them a gourmet breakfast, lunch, and dinner or if they could check in an hour from now, that doesn't mean their wishes will be granted. But you have to answer.
If it's a Request, you do have to either accept or decline within 24 hrs unless the guest withdraws the request before then.