Twenty minutes sounds like a long time to walk in, get something you already know you want, pay, and walk out.
Apparently the apple store near my house rarely gives people paper receipts anymore. It took 10+ mins for the poor sales drone to try every table in the store before he found the one that could actually still print receipts.
So I got to be the smart ass who said on the way out "goodness printing a receipt isn't that complex, i thought apple was a technology company."