Good question. If your surgery is done laparoscopically (with the camera and small incisions) you should be up and walking the day of surgery and feeling great within 1-2 days. You will be on a diet restricted to liquids and it does take some time to adjust to your new stomach. I recommend you have 10-14 days at home where you can focus on yourself and your new way of drinking. It is very easy to get behind in your intake in that early period which can set you up for dehydration. Also, drinking too fast can lead to nausea, vomiting and stretching of your sleeve.