- Edited
TIME could be like the delta from _process(). Or it might even be entire TIME from shader start, I forget which.
time_scale very well could be anything you would like it to be. using a value of 1.0 for 1 whole second.
side_to_side should be a distance value, at least this is what it looks like.
You may have to create your own time_scale and side_to_side.
EDIT: yes, I think TIME is entire shader start to end loop for each part of the drawing process. So giving it a time_scale makes sense.