"Ignoramus5749" wrote in message
...

I recently mixed three bags of ready mix, setting a mailbox post

http://igor.chudov.com/projects/Mailbox/


and it stayed wet and slushy for hours.

i


Where do you live? What sort of soil have you got? I'm in sand that
drains very well and the humidity is nil. I'm sure your location's
conditions make a huge factor in how long concrete will stay "slushy".