A payment takes 10 min to process. In what store can you buy something under 10 minute really?
Sometimes you have to wait 15 min at the tilt because the employee is a moron, if you could do that in 10 min i`d be very happy.
You just buy the stuff quick, pay for it, then put the bought stuff in a safe storage inside the magazine, and go looking at the other products until you wait for verification. Then after the verification is done, pickup your bought goods and leave.
It would change shopping habits, but whatever.
Not all blocks take 10 minutes, that's the average time but some of them I have seen to take more than an hour. It is a minor problem and it has been discussed before but if any store does starts to accept BTC as a payment method then the person paying with bitcoin has to wait until the Tx has received 1 confirmation because the shop owner won't accept payment until it has 1 confirmation and for now this is how it is.