After 3 hours I could not see much difference in how much ice had melted:
After rinsing and ironing I put both pieces of fabric onto my desig wall. The salted one is on the right:
I cannot say that the salt reduced the melting time of the ice. The pattern of the salted piece shows more white and has sharper lines, but is this the effect of the ice or just coincidence? I cannot say for certain. Guess that more experimenting has to be done.