How much time?

Somebody asked me this and I honestly don't know the answer so will ask it here. When we send off a PM and then later decide to edit, how much time does one have to do it? If you were to come back say 15 minutes later to make a change, would it be too late? (providing the PM hasn't been already read)

I realize that the edit window for a post is 8 hours, but I imagine that would not hold true for PM's.

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