Presearch users can collect 0.25 PRE tokens per search, up to a max of 8 PRE tokens per day between 12:00 (midnight) and 12:00 midnight UTC. 

To check to see if you've reached your daily max of 8 PRE tokens (32 searches), click on your token count (top-right corner or Presearch.org home page), you will see a page listing your transactions - if you see at least 32 searches today (UTC), you have reached your max of 8 tokens until tomorrow (UTC).