In the desert, you don't need 2 days
I've blocked several items successfully in a few hours up to one day (the longest was a large shawl knit in aran weight yarn). I live in Arizona, so it's a rare day when the humidity is over 10%.
I also help things along by putting a big ol' fan on the floor in front of the piece I'm blocking, and after an hour or so I move it around to a different side. Helps to lower the "local humidity" around the item I'm drying.