The truth is it seems pretty random. What's obvious is that the "withdrawals are processed in receiving order" is utter BS. Just now some people reports SEPA withdrawals clearing in 15/20 days, some others have been +5 weeks waiting.
International wires are processed in receiving order. No word about the processing order of SEPA withdrawals, but I suspect they start with the oldest and run through the queue while skipping those which are too large to fit within the daily quota. This means smaller SEPA withdrawals will have a small advantage.
If you have been waiting 5 weeks for a SEPA withdrawal, you should contact support and ask if anything is wrong. It probably is. Some wrong info perhaps, like joesmoe who misspelled his Japanese name, or it got in the international (SWIFT) queue by mistake.
5 weeks seem to be a short time, depending on the size of the withdraw.
05-14-2013 - 800 EUR sepa - received 05-21-2013
05-22-2013 - 500 EUR sepa - received 05-23-2013
06-01-2013 - 500 EUR sepa - received 06-04-2013
06-04-2013 - 1000 EUR sepa - received 07-30-2013
06-19-2013 - 500 EUR sepa - received 07-01-2013
06-27-2013 - 750 EUR sepa - received 08-08-2013
06-28-2013 - 750 EUR int.wire - still open
07-01-2013 - 500 EUR sepa - received 07-16-2013
08-09-2013 - 300 EUR sepa - still open
as you can see, it may take about 2 month for 1000 EUR.
my limit is 1000 EUR per day.
support giving just standard answers - no help.