According to research between 85% and 90% of sales training has no lasting impact after 120 days. At the same time, companies are spending billions of dollars on sales training each year. That's billions of dollars being wasted on limited sales performance impact and only short-term boosts in sales at best.
The key to lasting results from any training is an organized and consistent program for reinforcing the learning and practicing the new skill. If you question the need for that on-going investment of time and resources, think about the last time you learned a new skill. Imagine learning to golf or play the piano without on-going instruction, correction and practice. Improving skills and competency in a professional area without that follow-up support is a feel good but ineffective exercise.