func (b *ConstantBackOff) For(maxElapsed time.Duration) *ConstantBackOff {
	b.MaxElapsedTime = maxElapsed
	return b
}
func (b *ConstantBackOff) For(maxElapsed time.Duration) *ConstantBackOff {
	b.MaxElapsedTime = maxElapsed
	return b
}
// For sets b.MaxElapsedTime to 'maxElapsed' and returns b