  To observe CP-violating asymmetries through the interference of a weaker
amplitude with a stronger one in $\bo \to D^{(*)} \pi$ and $\ob \to D^{(*)}
\pi$ decays, one must collect enough events that the intensity associated with
the weaker amplitude would be statistically significant. We show that provided
the weaker amplitude is measured separately in $B^\pm \to D^{(*)\pm} \pi^0$
decays, the time-integrated approach requires around $2.5 \cdot 10^8 \ B \bar
B$ pairs for measurements of the weak phase $\sin(2\beta + \gamma)$ with an
uncertainty of $0.05$ or better. We also determine the optimal conditions for
precise $2\beta + \gamma$ measurements and discuss the possibilities for
resolving a discrete ambiguity.
