Two reservoirs are connected through a homogeneous and isotropic aquifer having hydraulic conductivity $\text{(K)}$ of $25$ $\text{m}$/day and effective porosity $\left ( \eta \right )$ of $0.3$ as shown in the figure (not to scale). Ground water is flowing in the aquifer at the steady state.

If water in Reservoir $1$ is contaminated then the time (in days, $\textit{round off to one decimal place}$) taken by the contaminated water to reach to Reservoir $2$ will be _______________