I am 5 weeks post op and my fluid intake varies greatly from day to day depending on my schedule that day. Some days I take in well over 64oz, other days (like today) I’m sitting here at almost 9 pm and I’m working on 18oz total for the day. I am usually good at having a routine and being a good post op boy, but some days it just doesn’t happen. So I’ll be awake for a while trying to hydrate myself before bed.