Structure your learning time into small units alternating with breaks. It works best if you define a concrete and achievable goal at the beginning of each learning unit and are happy when you have reached it.
Our brain needs a lot of energy for high-quality concentration; it is understandable that it cannot keep this up indefinitely. After 45 minutes at the latest, the energy drops. We notice this, for example, when our thoughts are suddenly elsewhere or when we suddenly hold the smartphone in our hands almost as if controlled by someone else, or when we make careless mistakes or simply don’t feel like continuing.
A maximum of 4 learning units of 45 minutes/day is enough, since the average performance for intensive mental work is around 4 hours/day.
Breaks are as important for learning as the learning itself. They serve to regenerate your performance and your motivation. Breaks guarantee that we continue learning well and with pleasure afterwards. The only rule: During breaks we should not do anything that has to do with information processing. Examples of what to do during breaks: eat something, drink something, move, knit, juggle, meditate, make a fantasy trip, take a nap, or do something useful: wash the dishes, fill the washing machine, clean the sink, …