When sending a prunable encrypted message I assume that the message will be pruned. 
But when will it be pruned? Is there a predefined default expiration time for it?
All nodes are required to store the prunable data for at least two weeks (24 hours on test net). But by default the nxt.maxPrunableLifetime value is 90 days. So you can expect that most nodes will keep the prunable data for 90 days. And there are archival nodes who keep the prunable data hopefully forever.
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Awesome. Sounds good!
Thanks!