The whole "Ni is about time, Si is about space" thing is taken way too literally by most. It only works in the most abstract sense, to the extent that it's not really even worth talking about, imo.
Si Example 1: My ESE boss knows the city of Milwaukee extremely well. No matter where you are, you can call him and ask him how to get anywhere else, and based on the time of day and any construction/detours that he knows about he can tell you the fastest way to get there. He also knows how long it will take to get from any location to any other location. Yes, it's time... something we've generally thought of to be a Ni aspect... but it's not underlying. It's readily apparent. It's Si.
Si Example 2: My ESE boss said to me one time, "If you're going to drive around with that later in your back seat, you should buckle it in so that if you come to a sudden stop it doesn't fly forward and hit you in the head." A lot of people would see this as Ni as well because it involves future events, but it's about the external dynamics of fields, not internal. It's Si.