Your time is your life. If you waste your time, you are wasting your life. I’ve never met a successful person who didn’t value their time, and I’ve never met an unsuccessful person who did.
Don’t let other people waste your time either, why is it when someone wants to “kill an hour,” they want to kill your hour as well? Protect your time, it can never be replaced, it can never be replenished, your time is your life.