dupe state can be easily manipulate through job system. Once a dupe master a certain job, by switching to tier 2 job (from junior researching to scientist), dupe gain +2 learning. This is probably by design, but when changing back to Researching, dupe keep the +2 learning. This can be done unlimited time (stat max at 50) by simply switching junior and senior job. Dupe does not needs to go to job station for each change to take effect.
1. Master tier 1 job 2. Switch to tier 2 job (gain stat boost) 3. Switch back to tier 1 job (keep stat boost) 4. Repeat step 2-3 (stat boost accumulating) Note: This only impact current session. Save/Load remove the accumulated stat boost and goes back to base stat boost.