How long would you wait on someone you have feelings for if they were going to be gone an unknown length of time?

Ez-Bri-Z_v2
I started talking to someone a little over a year ago and we both developed feelings for one another, but in July they needed to go deal with some things with no idea on a return date. We haven't talked in 3 months and I have no idea if I should move on or continue waiting. How long would you wait on someone?
How long would you wait on someone you have feelings for if they were going to be gone an unknown length of time?
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