You will not waste time while you read if you follow these rules:

• realise what and why you read - to stay motivated
• ask yourself - what you need to read next to be better in this theme
• make reading list about this theme
• read easy material after hard and vice versa
• read books again if you think that you changed/developed (for example - after a year)
• make reading habit:
  • put away phone and other distractions
  • set specific environment and triggers for and while reading (for instance - sit in unusual location / light candle / wear specific T-shirt / play specific ambient music / at specific time)
  • read everyday. Even if it is 1 page