Drawing the new block: From the High/Low to....

When drawing a new Supply or Demand Block, the videos sometimes say to just use the whole candle that made the high/low (top of wick and bottom of wick). Other times, the videos say to take the high/low and draw the block to the "adjacent" or "nearest" red/green candle. I've tried to find the rule or guideline for how to decide where the new block "ends," but can't seem to locate it. Are we looking to choose based on making the new block smaller, or is there some other determining factor?

Thanks!

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