So I bought some Bitcoins from CoinCorner with a purchase in mind. I sent £50 each in BTC to an Electrum wallet and a Bitcoin Core, on Linux, on a decent machine. Both wallets are now synchronising endlessly. The Bitcoin Core one is telling me that it will take 12 days. That sometimes increases to six weeks. I've googled and it seems that a lot of folk are reporting insane sync times... When can I expect to see my money?