It depends. How much food is there, is it even a feed site, is there a resting area nearby, how many birds are using the area, etc etc. If it’s a spot the birds are using to actively feed and they have other viable options around the general area, you’ll get 2 maybe 3 hunts and she’s toast. Maybe less if it’s less than 50 ducks total using it. If they have somewhere nearby they can escape pressure and feel safe 24/7, and you’re hunting their feed site, you can milk it for a little while if you’re smart about it. Hunt them during the middle of the day only and pick away at them in small groups. Don’t shoot into big wads of ducks. Go in after 9-10 am and get out of there no later than 4 pm. Don’t go in with too many guns. And be smart with your shots. This all assumes its several hundred birds or more using this area. If it’s not, fugg it… just burn em up with a smile on your face.