BackendModel.php

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<?php
namespace Magento\Backend\Model\Config\SessionLifetime;

use Magento\Framework\App\Config\Value;
use Magento\Framework\Exception\LocalizedException;

class BackendModel extends Value
{
    const MAX_LIFETIME = 31536000;

    const MIN_LIFETIME = 60;

    public function beforeSave()
    {
        $value = (int)$this->getValue();
        if ($value > self::MAX_LIFETIME) {
            throw new LocalizedException(
                __(
                    'The Admin session lifetime is invalid. '
                    . 'Set the lifetime to 31536000 seconds (one year) or shorter and try again.'
                )
            );
        } elseif ($value < self::MIN_LIFETIME) {
            throw new LocalizedException(
                __('The Admin session lifetime is invalid. Set the lifetime to 60 seconds or longer and try again.')
            );
        }
        return parent::beforeSave();
    }
}