Extend OTP duration

Hello,
is it possible to extend the OTP lifetime?
In my scenario I need to email or text the current OTP without forcing the user to install Google Authenticator for example.

```php
$google = new PragmaRX\Google2FA\Google2FA();
$otp = $google->getCurrentOtp(decrypt(Auth()->user()->two_factor_secret));
// email the code to the user
```

The problem is that by the time the user has received the email opened it, copied the code etc, the OTP is already expired in most cases. So is it possible to extend its lifetime before it expires?

Start with the PHP class entry point shown in the issue, getCurrentOtp(), and trace how the OTP lifetime is calculated. Determine whether the requested delivery delay can be supported without breaking authenticator compatibility, then define and test the behavior for an extended lifetime.

Written by the indexing model from the issue text.