Good question. I do not know until I see the data, and understand the problem I am going to solve. There might be many small questions need to answer along the way, then use EDA to answer these small questions. This thread may help: https://stats.stackexchange.com/questions/89678/how-to-keep-exploratory-analyses-of-large-datasets-in-check
Changing the world, one post at a time. Sr Data Scientist, Toronto Canada. https://www.linkedin.com/in/susanli/