heybud,
If the area you wish to deepen is clay and on a slope, a day or 2 in the sun will do it. When it looks dry, it is dry. If the area is not sloped and contains a lot of loam or top soil, it could take a week or 2 of exposure to dry. You can easily tell with a shovel. Just walk out on the area and dig. If you can dig large shovels full, it's too wet to hold a dozer. If it makes you say "Damn that's hard!", then you're OK.
