How long does it take salt to melt ice on the walkway outside?

We had snow and then freezing rain for hours and now I can't even step outside my door.

I sprinkled some pet-safe salt for ice on the walkway a few minutes ago.

Will it take a long time to melt the ice?

Help, I'm trapped. :(
Update: Well, it took A LOT longer than 2 hours. It was about 8 before it melted enough. It was very cold out though.
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