I didn't have chocolopo, but I did have some Gorilla Glue Autos from ILGM. The two strains share a lot of genetics so I would expect similar times.
Mine showed pistils on day 17 and then tripled in size over the next two weeks. For autos, I also count this as flowering (or preflower until they are done stretching). I make that distinction between flower and preflower because preflower still requires veg nutes. After the stretch is complete, it is time to switch to full bloom nutes, although I like to start cutting back on veg nutes and adding bloom nutes after the first week of preflower. This gives them a smooth transition so they aren't shocked when you go full bloom on them.
Mine took about 100 days total to finish although I let them run a few days longer. Good luck!!