Well 512 kilobits gives roughly 5.2 Gb in a day.So your numbers ain't that bad just a lil slow but given at that speed connection it's acceptable I think.
Only if you keep your computer switched on for fullday and night long and download continuously nonstop, phew, if my 90% of time is spent on downloading what the hell will i do with my life, eat peanuts in front of my computer for 24hrs? hell no, i got better creative jobs to do.🙂