using the conversion factor,
[tex]\begin{gathered} 1\text{ }year\Rightarrow52\text{ }weeks \\ 1\text{ }week\Rightarrow7\text{ }days \\ 1\text{ }day\Rightarrow24\text{ }hours \\ 1\text{ }hour\Rightarrow60\text{ }minutes \end{gathered}[/tex]then, we multiply them together,
[tex]4\text{ }years\times\frac{52\text{ }weeks}{1\text{ }year}\times\frac{7\text{ }days}{1\text{ }week}\times\frac{24\text{ }hours}{1\text{ }day}\times\frac{60\text{ }minutes}{1\text{ }hour}=2,096,640\text{ }minutes[/tex]