I did this quest a short time ago, and I'm pretty sure it took less than 10 days for the messenger to arrive. I slept at the inn at the promenade, and the messenger appeared after I left the inn, not while I was in it. So sleep for 10 days, then leave the inn and you should meet the messenger. If not, there may be a bug. No biggie, the quest is worth little and is lame. Just ditch that foolish Nalia ASAP.
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