How long is too long for burnout?

Been experiencing burnout now for close to a month. I've always told myself I would never have a job I dread going to, and here I am. How long is too long for this to last? As stupid as it sounds I've always wanted to sell exotic cars and I have an opportunity to do so, but I could never have imagined leaving a secure cyber sec job to be a car salesman, I can only imagine my bosses expressions …

burnout cybersecurity