3.0.x-and-above/upload/catalog/controller/extension/module/facebook_business.php [201:218]:
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    private function estimateFeedGenerationTimeWithDecay($feed_gen_time) {
        // Update feed generation online time estimate w/ 25% decay.
        $old_feed_gen_time = $this->config->get('facebook_feed_runtime_avg');

        if (!$old_feed_gen_time) {
            $old_feed_gen_time = 0;
        }

        if ($feed_gen_time < $old_feed_gen_time) {
            $feed_gen_time = $feed_gen_time * 0.25 + $old_feed_gen_time * 0.75;
        }

        $data = array(
            'facebook_feed_runtime_avg' => $feed_gen_time
        );

        $this->model_extension_module_facebook_business->updateFacebookSettings($data);
    }
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2.3.x-and-above/upload/catalog/controller/extension/module/facebook_business.php [199:216]:
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    private function estimateFeedGenerationTimeWithDecay($feed_gen_time) {
        // Update feed generation online time estimate w/ 25% decay.
        $old_feed_gen_time = $this->config->get('facebook_feed_runtime_avg');

        if (!$old_feed_gen_time) {
            $old_feed_gen_time = 0;
        }

        if ($feed_gen_time < $old_feed_gen_time) {
            $feed_gen_time = $feed_gen_time * 0.25 + $old_feed_gen_time * 0.75;
        }

        $data = array(
            'facebook_feed_runtime_avg' => $feed_gen_time
        );

        $this->model_extension_module_facebook_business->updateFacebookSettings($data);
    }
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