The length of time taken for funds to transfer to your bank account has more to do with the processing time by your bank than when ebay processes the transfer.

I used to be horrified at the time people were reporting to get transfers from paypal to their bank accounts....anything up to 5-7 days.  As long as I initiated the transfer before 5.30pm I had the funds the next morning.

Instead of blaming ebay for slow transfers, find out your own bank's processing times.