Hello Rookie Buyer
It depends on the property truthfully. If I am looking at a unique property then my distance may change to incorporate more comps. However, most of the time I will only look maybe at a mile radius around the property. But in addition to distance I look at properties that are similar in sqft, bedrooms, lot ize, year built, etc. I would recommend that if your looking at comps to purchase to ask your agent to run comps before making an offer. I wish you the best of luck!