Not even that...
30 minute flight time is there-loiter-back so you need to figure in time taken for the meatsack to get to the door, figure out what the flying buzz-y thing wants, go back to find proof of ID and sign for the contents (hopefully before the drone unlocks the cage!), remove the item(s) and close the cage before the drone can start the return journey so you don't get anywhere near a 30-minute radius.
Unless they're planning on using something like the Predator/Reaper drone, in which case the accuracy of delivery will be magnitudes better than the current delivery drivers (although there may be slightly higher risk of collateral damage when your Amazon delivery tags a pigeon on its way down...)
Biting the hand that feeds IT
