A group of workers A, B, C and D is assigned to complete a construction project. They have varying efficiencies, and the time taken by each of them individually to complete the project is given as follows: A takes twice as long as B, B takes three times as long as C, and C takes four times as long as D. Together, they complete 1/4^th of the project in 5 days, working 8 hours per day. However, due to unforeseen circumstances, workers A and D are unable to continue working on the project. The remaining work is done by workers B and C. If B and C work only 6 hours a day, find the number days required to finish the remaining project by workers B and C.