You are simply glycogen depleted and are retaining water.
For losing the water, it takes anywhere from 6-30 days. Yes, I did say '30' days. But when I say 30 days, that means being totally free of retaining water. It's happenbned to me before and that may have been simply from doing too many DNP cycles.
Also, as a reminder, make sure to really watch your diet when you get off DNP since you will put a shit load of fat back in your body if you are not careful.