I have written many papers, including investigation reports. There is no limit to this, mainly depending on whether there is a catalogue in your paper requirements. If you want a 500-word list of metropolitan drugs, if you don't want it, even if it's 10000 words, you won't write the list.

Well, generally speaking, you need a catalogue of more than 3000 words.

As long as there are rules on 20 pages, if there are no rules, add your own table of contents to make it perfect, so as to consult articles.