PPI's
Really, the only way you'll know is:
1. Do you get any reflux symptoms at all now? If so, stay on them.
2. If you don't have, you can talk to your doc about dropping to one a day, evaluating, then dropping to zero. But that should be a discussion between you and your doc.
You may never need it again or need it forever.
I've had reflex for ages -- so overall, a PPI is not a pill you can drop without potentially serious consequences. The acid can erode your esophagus, leading to a precancerous or cancerous condition. Not good. For me, I didn't have the "typical" reflux symptoms pre-op -- my symptoms were nausea and what felt like post-nasal drip. Now, I sometimes get the full acid in the throat thing at night (yuck!).
Just mentioning my previous symptoms so you'll know to watch out for those as well, since they are easy to attribute to something else, but can still end up damaging your GI tract!
Hopefully, you'll be one of the lucky ones and ditch the pills soon!