Follow directions.
To be honest I had used something similar before and left on for 2 hours and didn’t think it was enough time, so this time before bed I put them on over night.  It took about 3 days to start peeling but than it was hard to get ALL the peeling off.  Went about a week of attempting to remove the product. So my bad that I left on way more than 20 minutes, but my feet do look and feel better.  Just follow directions.
Rating: 5 stars