get you time spend by on a geo-coordinate using you json from Google timeline

download only your Location History JSON file at https://takeout.google.com/settings/takeout

on the params.js file fill thoses inputs:

param	value
jsonFile	path to json file (no extension)
from	a moment object with the starting datetime
to	a moment object with the ending datetime
maxDist	the tolerable radius that we should considere a valid point (in meters)
maxDeltaTime	how much time must have spent between two records to be considered a visited point
pointOfInterest	the x,y geo-coordinate we are interested in