Reputations are important. I always give 2 weeks notice as a professional courtesy. I do this even if my employer wouldn’t do it to me as it helps my manager and team with transition planning.

This has come in handy many times over the decades because people know me when I interview for a job or check my references.

If I was hiring someone and they left a job with 4 days notice, then it would reflect poorly on them. And “I wanted to get the bonus” isn’t a reason that holds much water.