How long is your credit eval good for

[Tlm]

I was applying to WGU and looking to knock off some credits and my research brought me to this group. I am now over loaded with credit and school options.  I have a 3 year BA from the University of Toronto in Economics.  They don't offer these degrees anymore, but is basically all Economics with no general education credits.  I can't get into a masters with it and I can't teach as it is not a 4 year degree.  I was looking at WGU education but now that I realize I can probably convert it to a BA at one of the big 3 and then apply for a Masters and it would be a better use of my time and money.  I was wondering how the credit evaluations work. Do I send my transcripts to all 3 then take some SDC, SL, CLEP etc.  credits and then submit them for another evaluation?  How long would this remain accurate?  Can I do the courses, ACE, CLEP etc.  while enrolled at one of the Big 3 and transfer them?  How does that work?