We show that Whitham type equations $u_t + u u_x -\mathcal{L} u_x = 0$, where $L$ is a general Fourier multiplier operator of order $\alpha \in [-1, 1]$, $\alpha\neq 0$, allow for small solutions to be extended beyond their ordinary existence time. The result is valid for a range of quadratic dispersive equations with inhomogenous symbols in the dispersive regime given by the parameter $\alpha$.
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