Okay, I got the real info. direct from Amex:
https://twitter.com/#!/AskAmex/statu...37964913111041
Apparently, you have 60 days to dispute a purchase but that date is taken from 60 days after the date of promised delivery. So, if the merchant said it would be delivered in 14 days for example, you then have 60 days from then in order to be able to dispute the charge.
Seems like a good and liberal dispute policy to me.
Note, this is only for items not received. For other types of disputes, it sounds like it's 60 days from the purchase date.