I usually aim for 48 hours. I'm fortunate to have a drying spot I can drop the heat to 50° so I dont dry too quickly. I only make hash in the winter so humidity is already low, around 30%, which is good .
Letting it dry too long can cause terp degradation but also makes the hash difficult to work with I've found ( hash texture is also strain dependent as well imo) freeze dryers have taken hash drying to a whole other level. They make it possible to dry hash without terpene loss.
If your opening your hash container daily, that might be enough " burping" to avoid mold. I do this for a couple weeks before long term fridge storage.