Until the mid-1970's, the Cryovac plant of W.R. Grace, a global producer of chemical, construction, and container products, dumped varying amounts of toxic chemicals, including the industrial solvent trichloroethylene, on its property in Woburn. These chemicals, often referred to by the general term volatile organic compounds (VOC), seeped into the groundwater beneath Grace's property and migrated through the underlying aquifer in a southwesterly direction. The head map below shows the groundwater flow from the W.R. Grace plant (marked "WRG" in the top right corner) to Wells G and H, part of the Woburn municipal water supply.

If the average saturated aquifer thickness is approximately 20 m, and the porosity is 0.15, and the hydraulic conductivity is 20 m/day. Compute the time it takes for a spill at the WR Grace to reach the well(s).