The full blockchain data is over 21 GB as of today, and so it will take quite some time for you to download the data.

If you use bitcoin-qt to download it directly, the download speed would be depending on your peers' upload rate and so it would likely take much longer time to finish the initial sync compared with using the bootstrap torrent Mikez suggested.


You could also use some SPVs like Electrum and Multibit, which don't require you to have the full blockchain.