New employee training should begin before the first day of work and continue for at least 6 to 12 months. This gives enough time for new employees to get to know their tasks, how to perform them well, and receive enough guidance and support to become successful in their roles. Having a well-defined training plan can help new employees keep track of their training plans and progress, and for managers and leaders to see how well new hires are progressing and what skill gaps need to be bridged.