configディレクトリのjwt.phpのファイルで設定できる。
jwt.php
/*
|--------------------------------------------------------------------------
| JWT time to live
|--------------------------------------------------------------------------
|
| Specify the length of time (in minutes) that the token will be valid for.
| Defaults to 1 hour.
|
| You can also set this to null, to yield a never expiring token.
| Some people may want this behaviour for e.g. a mobile app.
| This is not particularly recommended, so make sure you have appropriate
| systems in place to revoke the token if necessary.
| Notice: If you set this to null you should remove 'exp' element from 'required_claims' list.
|
*/
'ttl' => env('JWT_TTL', 60),
デフォルトで60(1時間)に設定されている。
ここを変更することで設定可能。