I would imaging it would depend on what computer you have, but for what it is worth it takes about 3 minutes (!) on my old P233 laptop. Binning 2x2 brings it down to a more manageable 45 seconds.
Under a minute if you have sufficient memory. It can take longer if your computer is using virtual memory (spooling memory to the disk instead of using RAM).
I have a new Athlon 1.4 GHz processor with 250 meg of ram. So based on your information download time should be in the 1 minute time frame. Kinda makes the ST-2000XM look really good!