I seem to go through a couple of pairs of these a year, I don't keep track of how many days. I'd say they last about as long as a pair of fleece gloves. NRS does make other models, some with reinforced palms and fingers that would probably last much longer. I can't bring myself to give up the dexterity though.
I did try some much cheaper neoprene gloves from glacierglove, and they were trashed in two days of climbing. I decided that the NRS ones were more economical in the long run. I've given in to gloves being a consumable item.