Nice work!
I had to do this for mastering a matrix of 2 digitally-recorded sources whose clocks obviously did not sync up. After an hour one source was .06 seconds longer. Clearly not much, but for a matrix, it became obvious very quickly when one was out of sync. I time stretched one of the sources by .06 seconds and then it was very close (though I still had to do some minor nips and tucks of a few samples here and there between songs to make them align properly).