UPS anticipates that its busiest day in the lead-up to Christmas will be Wednesday 20 December. The package delivery company estimates that it will deliver more than 21 million articles worldwide - that's about 240 every second - on what it calls "Peak Day".FedEx on the other hand predicts that it will deliver 8.5 million items on their peak day of 13 December.The continuing growth in online shopping will result in even more parcels being delivered by post this year in Australia. And how many UMS (householders) will Contractors have to deliver during December now that AP has relaxed its restrictions on Christmas UMS lodgements?Which day will be your peak day in the Christmas period?