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Do the arithmetic, 15Mbits/s is (the key word here is bits) 15/8Mbytes per second (roughly excluding any parity bits etc) which is just under 2Mbytes per second = 120Mb per minute 2Gb\120mB is roughly 17 minutes thats without taking in to account any handhaking or parity bits etc. In practice my 15Mb/s speed card transfers slightly faster than that.
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I'm going to contradict myself here, while the arithmetic is sound, cards are actually rated at MBytes/second, If you get a fast USB or firewire card reader that same 2Gb will transfer in under a couple of minutes. The slow transfer rates I have measured are due to poor reader performance particularly from the inbuilt card readers.
I bought a
Sandisk Imagemate USB2.0 reader writer the other day and the performance is outstanding. The reader will take all common card types and can transfer at up to 34MB/s