If I use iMessage to send a message to someone, how long will iMessage attempt to deliver the message (1) before trying to send the message as a text message and/or (2) before simply abandoning the message and not delivering it at all? For example, let's say I use iMessage on my rMBP to send a message to a person's iPhone and I use their AppleID rather than their phone number. Now let's say the person's phone is off or they're in an area with bad service. Will the iMessage to an AppleID simply fail when sent, or will the system keep trying to deliver it for minutes, hours, days? With text messages, it's usually 2 or 3 days, minimum, but I haven't seen this info. for iMessage. Thanks.