From Minecraft Wiki:
The cloud starts with a radius of 3 blocks, decreasing to 0 over the course of 30 seconds. During the time the cloud is there, any player or mob that walks into it after the first second will get the corresponding status effect; this decreases the radius by 0.5 block immediately, causing the cloud to disappear more quickly.
At most how high should a player be (the player's
Y position) from the cloud of Lingering Potion in order to be considered inside the radius, thus getting the effect?