I have not found a way to change the frequency that is why I use WP-CLI for updating WordPress, plugins, themes and language files. Anyway I prefer to do it scheduled on a defined time e.g. nightly.
With a Cronjob you can execute as many times a day you want. I use this commands:
cd /folderToWordpressInstallation
&& wp core update && wp plugin update --all
&& wp theme update --all
&& wp language core update
&& wp language plugin update --all
&& wp language theme update --all
wp command must be available on your web hosting. It can be downloaded here https://wp-cli.org/. Either use /path/wp or add path to wp command to your PATH variable within hosting environment. Then path prefix is not needed.