I usually start the Guides and make a list of a few champions and key points i want to add in the Guides, and then take hours to make sure everything is ok. Then i try and take some time to make sure i addressed everything I wanted to address. It is time consuming, but i like doing it. However, since I do not spend weeks or days on mine, my guides are not the best. And I admit that. But I am trying to improve, so let me know what I can do better at, and I'll try my best
Otherwise, I wouldn't think anyone could make a "few" which means 3 or 4 guides.