How many days until you disable inactive user accounts?  How many days until you delete inactive user accounts?

If you are out on HR approved medical leave the account is locked as part of the process usually within a day. In Europe since many take 4+ weeks of vacation at once we allow 5 weeks. In the USA it’s 3 weeks. If the employee quits or is fired or laid off it’s disabled immediately.

4 weeks

I define my own policies based on their security requirements, compliance regulations, and risk management practices. These policies often consider factors such as the nature of the organization's business, the sensitivity of the data accessed by the user accounts, and the overall security posture. 
The number of days before disabling or deleting inactive accounts can range from a few weeks to several months