As an example, the corkscrew experiment is done with learners. In the corkscrew experiment, the trainer shows the learners five different words for the term “corkscrew” in exotic languages. Learners have 30 seconds to memorize the terms. After this phase, the trainer continues the lesson or lecture. After the lecture or the instruction, which should last between half an hour and an hour, the trainer gives the participants a few sheets of paper on which they should write down the terms that were noted for the corkscrew.
The result is always similar in all age groups: 5 % to 10 % can remember a word, all others do not remember any of the exotic words. (https://www.fade-in.eu/web/el/sustained-learning-the-corkscrew-experiment, NO DATE).