So some quick math:

65k (your low end, reported) / 1024 = 0.006347... MB/s

Times 60 = 3.8 MB/minute

Times 60 = 228.5 MB/hour

Times 24 = 5484.375 MB/day

Divide by 1024 to get that in GB = 5.3558... GB/day

So it would take you just over a day to do the Stormblood download, unless your numbers were exaggerated, or you are really getting only 20KBps, at which point the game would literally be unplayable.

I smell exaggeration.