What factor was considered in Harrion v Southward and Vauxhall Water regarding the use of land?

The correct answer focuses on the duration of the interference, which is a crucial factor in nuisance claims. In the cases of Harrion v Southward and Vauxhall Water, the courts emphasized how long the interference with the use and enjoyment of land had persisted. This aspect helps determine whether the interference is substantial enough to be actionable as a nuisance.

When considering nuisance claims, courts often evaluate whether the length of time a nuisance has existed contributes to its severity and impact on the affected property owner. A longer duration may imply a more serious disruption and a greater likelihood that the nuisance is harmful or unreasonable.

In contrast, while the market value of the property, the number of affected residents, and the history of land use are relevant factors in evaluating the overall impact of a nuisance, they do not specifically align with the primary consideration in these cases. The focus on duration allows for a clearer understanding of how consistent and ongoing an interference can be detrimental, guiding the court's assessment of the nature and legitimacy of the claim.