Time between blocks

I'm trying to use a spawns loop in a collab that I'm optimizing, but I need to know how much time it takes for the cube to travel one block at certain speeds (specifically at speed x1, but if you have information for all speeds, I'd appreciate having that).

Is this information known? I've seen in the past some video or something where it was actually known and measured accurately, but I can't remember where. I've searched for it and can't find it.

I thought about measuring it myself, I don't mind if it takes a lot of time, but I wouldn't want to end up being wrong and not finding the exact value. Do you have any ideas about how I could measure it?