Stonerdanswered grow question 4 years ago With a 20 liter pot size I'd say go with a 3.5-4 liter nutrient rich irrigation every 2-3 days or when the top 5cm of the medium is dry!
Make sure there is at least 20-30% runoff (more wont hurt), check the runoff for pH and salinity (EC) to get a good idea of your soil fertility and acidity to quickly fix issues before any serious damage is done or to prevent them from happening.
Hope this helps! Good luck and happy growing :)