The cut off date for Monday through Saturday shipping is 9:30 AM, Eastern Time. I personally operate by myself 7 days a week, 52 weeks a year and ship 6 days a week. Since USPS ships and moves product 7 days a week, the majority of domestic customers will receive their order via 1st Class Mail in 3-6 days and via Priority Mail in 2-4 days, rarely 7-9 days after PayPal payment, no matter what day it was paid for.
I have been selling new automatic transmission parts exclusively for vintage cars, 1946 to the mid 60's for over 45 years now, starting in 1977. During this time I have accumulated over 20 tons of misc. mechanical car parts from the early 30's to the 70's. I am now starting to offer these parts for sale on eBay.