Great question! 20 minutes 5 times per week is a good amount, and can be increased as you are able to do without adding stress, which would counteract the benefit. 🙂

Ideally, in addition to memory games, try using a variety of puzzles and new learning activities that exercise your brain and keep neuronal pathways fit. In addition, other aspects of brain health outlined here are vitally important including adequate restorative sleep, regular physical movement/exercise, stress attendance, social engagement, and an anti-inflammatory, nutrient-rich diet.

Best to you!