If someone doesn't have PP linked directly to a bank account, sometimes it treats the payment the same as a paper check. PP will not release the funds until they get official approval from your bank. That can take several days.
When the accounts are linked PP can access the funds immediately like a debit card.
Both eChecks and Instant Transfers are ways to pay with your bank account. With an Instant Transfer, the recipient receives the money right away. You only need to have a confirmed U.S. bank account to send an eCheck, but an Instant Transfer also requires a backup funding source such as a credit or debit card registered on your PayPal account.
Let's hope it doesn't take 14 days because I will just cancel my bid then, not gonna bother waiting 1 month or more on my cover.