Using the square root of time rule: $\text{VaR}_{T\text{-day}} = \text{VaR}_{t\text{-day}} \times \frac{\sqrt{T}}{\sqrt{t}}$. For T=10 and t=2, this gives $\frac{\sqrt{10}}{\sqrt{2}} = \sqrt{5} \approx 2.236$, not 5.59. The calculation in the text appears to have an error - it should be approximately 2.24 times, not 5.59 times.