extremely slow download speed ps3

ok so im doin a fresh install on a brand new ps3 the main update is like 4gb (if im reading it right) and it says its downloading at .40 mbps with 23 days remaining..... umm im no mathematician but at .40mbps 4gigs should only take about 2 days to download so whats this 23 days thing? speaking of which why is it taking so long to begin with? I have other games downloading in the background from the ps store but as we all know all psn downloads poss when youre playing a game that access the internet soooo those couldnt be causing the download slow down, the game is also 6 months old so unlike at launch theres not a million other ppl trying to download too sooo that couldnt be causing the slow down, also lets say i cancel or quit the download and try again later ill it pick up where it left off or start all over? cause seriously who expects anyone to leave their ps3 on 23 days straight