Last year I did a project. One activity was pouring a concrete pad. It took $10$ hours. This year I have a similar project to pour a concrete pad that is $20\%$ larger. Some experts say that since I did it last year, this year I can do better and get it done $20$ percent faster than last year. Other experts say this year the labour is not as good and so I will get it done in $30\%$ longer. How long should my duration be$?[8].$