Yeah. Days for a transaction to settle is common with investment houses, which is what Coinbase is acting as in these transactions. I suspect it also gives them time to try to find a lower price in the market to make some margin off the original order. The credit for the order hits your account immediately, but you won't see the number of coins you add available for about 5 days. This is only with direct bank account transactions with Coinbase. If you order through them with a credit card you'll see the coins in your account almost immediately, but they'll also charge you 3-5%.