A clock pendulum having coefficient of linear expansion, $\alpha = 9 \times 10^{-7}\,/^\circ\text{C}$ has a period of $0.5\,\text{s}$ at $20^\circ\text{C}$. If the clock is used in a climate where the temperature is $30^\circ\text{C}$, how much time does the clock lose in each oscillation? ($g = \text{constant}$)