Yes, not allowing reactants in a to have enough time to fully react can count as human error in a lab. In chemistry, reaction time is an essential factor in determining the completeness and efficiency of a chemical reaction.
If the reactants are not given sufficient time to react, the reaction may be incomplete, leading to inaccurate or inconsistent results. This can happen due to human error, such as not monitoring the reaction time or not following the reaction protocol correctly.
Therefore, ensuring proper reaction time is crucial to obtain reliable and accurate results in a lab.