I have about 400 districts from which I need to know the time of traveling by public transportation to 190 buildings. So that amounts to about 68000 pairs of districts and buildings. So the end result will be a matrix whose rows correspond to districts and columns correspond to buildings, and each entry of the matrix is the time of travel from the district corresponding to the row in which the entry lies to the building corresponding to the column in which the entry lies (see the attached excel file for buildings and districts).
You will need to type in each pair of building and district into the google map and click get direction to see what is the shortest time of travel using public transportation at a specific date and time (which is in the past, and google map lets you set the date). The buildings and the districts are in korean so you need to be able to type in koreans.