As with all social etiquette, it's a guideline, not a law. The outcome depends entirely on your relationship with your boss and what kind of position the team is left in when you leave.
Don't you have it defined in your contract typically? It is in the UK. Two weeks is about the minimum it'd be for a professional job, often more with seniority or time at a company (i.e. contact will say +1 week for every two years or whatever).
Most employment positions in the US are at-will, meaning either party is legally allowed to terminate at any point for no reason given, barring legal protections against discussion and retaliation.
It's different if you're a contractor (i.e. not an employee but hired for a specific contractor term) or in a union (not an issue for most software engineers). My experience with both is indirect.
As with all social etiquette, it's a guideline, not a law. The outcome depends entirely on your relationship with your boss and what kind of position the team is left in when you leave.