Challenge: Jesus Was Only Dead for Three Days

Here's a challenge someone directed me to on Facebook:

A: Length of sinner's death

B: Length of redeemer's death

A = B?

Is there an injustice here? Jesus was only dead three days, whereas people are in Hell for eternity. Did He fail to pay for our sins? How would you explain this? Tell us in the comments below, then we'll hear Brett's thoughts on Thursday.