I tried several times to play more than 2 tables at the same time, it's terrible
If you play without the help of statistics and analytical programs, it is impossible to monitor the tables and correctly evaluate your opponents. Sometimes I have to play 2-3 tables at the same time, it depends on the start of the tournament, but I can never complete more than 1 table with a good result. I think if you want to really learn how to play poker well, you need to play one table (maximum 2) to be able to analyze the game and carefully study your opponents.
Of course, it is difficult to sit for many hours in a tournament and watch the game (especially difficult if you don't have anything to play with), but I suggest reading news on the Internet or other interesting articles (information), this helps a lot not to lose focus in poker and not get tired of the game