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Pokemon do not "move" in GO. Once they spawn in a location, they tend to stay there until despawn.

Pokemon will tend to despawn after 15 minutes of being in a location, with some minor outliers of at least up to 30 minutes in some cases.

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Pokemon do not "move" in GO. Once they spawn in a location, they tend to stay there until despawn.

Pokemon have an attribute which controls spawn behavior (likely TimeTillHiddenMs and ExpirationTimeMs in the protobuf files), which determines their spawn length. For the most part, Pokemon will despawn either 15, 30, or 45 minutes after initially spawning, although some outliers do exist as this is a server-side variable.

Pokemon do not "move" in GO. Once they spawn in a location, they tend to stay there until despawn.

Pokemon will tend to despawn after 15 minutes of being in a location, with some minor outliers.

^(source)

Pokemon do not "move" in GO. Once they spawn in a location, they tend to stay there until despawn.

Pokemon will tend to despawn after 15 minutes of being in a location, with some minor outliers of at least up to 30 minutes in some cases.

^(source)

Pokemon do not "move" in GO. Once they spawn in a location, they tend to stay there until despawn.

Despawns seem to happen fairly randomly, with rare Pokemon (of course) despawning much faster than common Pokemon.

While there is no accurate information as to despawn rates (as of yet), it is a safe bet that a Pokemon will not be there after two or three hours.

Pokemon do not "move" in GO. Once they spawn in a location, they tend to stay there until despawn.

Pokemon will tend to despawn after 15 minutes of being in a location, with some minor outliers.

^(source)