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In Sobolev spaces, the time of existence and stability is of order $\\varepsilon^{-r}$ for arbitrary positive integer $r$. In Gevrey and analytic spaces, the time is of order $e^{\\frac{|\\ln\\varepsilon|^2}{c\\ln|\\ln\\varepsilon|}}$ with some positive constant $c$. 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In Sobolev spaces, the time of existence and stability is of order $\\varepsilon^{-r}$ for arbitrary positive integer $r$. In Gevrey and analytic spaces, the time is of order $e^{\\frac{|\\ln\\varepsilon|^2}{c\\ln|\\ln\\varepsilon|}}$ with some positive constant $c$. 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