Unfortunately there isn't a clear time length for any of them, and many of them involve improvement over long periods of time. For example, he got the concept of putting the shape in the shape sorter hole within about 5-10 minutes, but to start learning the shapes took weeks, and
Nope, it's not! Based on his photos you might assume that his tongue always hangs out, but that's just because I tend to upload photos where it's out. I normally ask him to stick out his tongue before I take a photo!
Although his tongue does hang out a lot