You can follow the steps to remove the timer from the Next button in the Training Readiness slides:
Navigate to Management > Settings > Training > Content.
In the Configure Timer On Slides field, you can define the number of seconds an employee has to wait to click the Next button (it is disabled by default for the configured time) to move to the next slide.
Add a value equal to or greater than zero seconds.
Apply to slides only: If enabled, the slider timer settings will apply only to slides in a training module.
Apply to slides preview only: If enabled, the slide timer settings will apply only to slides in a training module in the preview mode only.
Clicking on Reset changes the value to a default of 4 seconds.