I am very new to mining. I would like to know size of blockchains of cryptocurrencies like bitcoins, litecoins etc.
As I am having a slow internet connection, it would be great help to me if I could know the size of almost all block chains.

Update: If I want to start mining in pool only, then what should do with BTC & LTC address that I get when I install Qt client? Are they totally wasted?

Thanks for helping