With PrivateStatus you can hide the online status of your server from unwanted players. This is especially worthwhile for private servers with a whitelist to prevent this. This plugin only works on Paper 1.20+ and is not compatible with Spigot. This is because this plugin relies on the so called ServerListPingEvent which can only be cancelled when using Paper.
The configuration is in plugins/PrivateStatus/config.yml and looks like this. Please only edit the expiration-minutes option. The known-addresses section is managed by the plugin itself. The option expiration-minutes defines how long an address should be kept in the history. The plugin automatically checks every 10 minutes if entries expired. If so, it removes them.
# The amount of minutes after which addresses will expire. Minimum: 10.
expiration-minutes: 1440
# A list of already known addresses.
known-addresses: {}