Drying sand in the oven- anyone try it?

Hi gents & ladies,

I'm going to use monitors in my home office, got some really nice four-pillar Focus stands to sit the speakers on. I want to fill the pillars with sand, but want to make sure the sand is completely dry before I fill'em up. Why not use the oven? Heat it up and let the sand bake for a while. Have you done this? What temp? For how long? Thanks, Jeff