Does anyone know the longest gap we've seen historically for TB purchases to be refunded? I've seen comments to a few weeks, but wasn't sure if anyone knows specifically.

Once we pass that point where it's highly likely that it's dead, is there any harm in calling Amex and asking for it to be reimbursed? If it's dead, I don't see any downside since they already know. I'd appreciate perspectives, so I can determine if it's better to call or write it off. Thanks