try 'docmemory' from
www.simmtester.com
when i called in to get an rma from crucial, they asked what i used and i said docmemory and that's all they wanted.
as for time, there are 2 options in docmemory. the quick test and the normal test i think.
i ran the long one and it found like 10 errors in 45 mts or so (the test was still going, but i only needed to see the 10 errors).