If you set it to daily withdrawals, it will (supposedly) process overnight/early the following morning, and reach your account on the 15th (if you're with the right bank).

eBay say to allow 2-6 days for processing, but there have been some members here reporting that they've received funds the day after their respective sales (e.g. sale on the 14th, bank account has the money on the 15th), while others have been taking longer.

eBay seems to be having MP teething problems and it hasn't been consistent, but assuming they hit their stride it seems possible to be receiving each day's proceeds the following business day.

Expand the 'Getting Paid' section on this page.

Disclaimer: I'm only summarising other members' reports as I haven't yet changed over to MP.