How exactly do they award credits? I've had my machines working on this for the grand total of 36 hours and I'm up to 342.41 credits. I don't know if it's fast or anything like that.
Quick version:
Step 1/ You and several others download WU
Step 2/ The first ones back that agree with one another set the awarded credit
Step 3/ All those who return the correct answer get the same crediit
Step 4/ Credit is based on the amount of work your computer needs to do to get the answer.
Step 5/ You may have a cache for up to 10 days and that will cause you to have WUs completed and retiurned for which you have yet to recieve credit