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So I was thinking about this when I was trying to come up with the largest Roman Empire possible on paint (I was really bored), so I decided to ask you guys this. I know this question has come up a lot, but I thought it'd make for a nice discussion.

Assuming Hadrian doesn't willingly give up Trajan's conquest of Mesopotamia, or someone other than Hadrian succeeds Trajan, how long do you think the Romans could plausibly hold on to Mesopotamia before the Parthians or *insert Persian group here* retakes it? I would imagine 100 years would be possible but I am not too sure.
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