Enough to pay for the bills, food and rent. And a little bit for social and entertainment purposes. Having enough to run a car may be required if your job means you can't use public transport for whatever reason (location, working hours). Things will vary depending on whether you live alone or have a family, of course.
We do not need Gucci, Ferrari, Rolex or fine dining. It's fine to want them, of course, but if we are miserable without them then we need to look within for answers to true happiness because even if we bought a Rolex, we will only be happy briefly. Plus we will be worried about losing it as we know we would be unhappy if we lost it.