250r craigslist scam

My mom used to work at a bank. If I remember correctly a check can take up to 10 bussiness days to completely clear from one back to another. Like, if the check was writen from say Chase bank and your bank is Comerica. If both accounts were through the same bank its a few days. But being this guy is sending a certified check I bet it woudl be a couple weeks before it was cleared, if it does.