The Ebbinghaus forgetting curve isn't a theory anymore. A 2015 replication published in PLOS ONE ran the experiment again and found the same shape Ebbinghaus found in 1885. Most of what your team learns in that room is gone before they've finished the week.
Reinforcement is what changes that: spaced practice with feedback, repeated over months. Everybody agrees with this. Almost nobody does it, because it means somebody has to run the practice every week. We built the practice in so nobody has to.
Read the science behind why training fails and how to fix it