They lasted me anywhere from 6 months to 9 months of hard use every day. I could walk right through 4" deep puddles and never get my feet wet.
I had one pair that leaked when new and Danner replaced them for free.
This was over 15 years ago though, so I have no idea if the company only makes crap now or not. My last two pairs of Danner boots were glued on (not stitch down) soles and made in Taiwan or some shit. I got them as a gift so didn't complain. Maybe $40-$60 boots quality wise. The Danners I wore everyday at work were around $200 15-20 years ago.