I drained my fresh water tank and forgot to turn off the pump. Might have ran dry for almost a day before I found it. It still pumps but I was wondering how much damage I did.
The pump is most likely the rubber bellows type. Since it is just rubber flexing, it does not hurt it to run dry. OK, maybe you consumed some of its life just because of the hours put on it, but no specific damage for it running continuously.