Deprecate the old filter instead for clarity

providers/class-two-factor-email.php

@@ -144,14 +144,25 @@ public function user_token_lifetime( $user_id ) {
 	public function user_token_ttl( $user_id ) {
 		$token_ttl = 15 * MINUTE_IN_SECONDS;
 
+		/**
+		 * Number of seconds the token is considered valid
+		 * after the generation.
+		 *
+		 * @deprecated 0.11.0 Use {@see 'two_factor_email_token_ttl'} instead.
+		 *
+		 * @param integer $token_ttl Token time-to-live in seconds.
+		 * @param integer $user_id User ID.
+		 */
+		$token_ttl = (int) apply_filters_deprecated( 'two_factor_token_ttl', array( $token_ttl, $user_id ), '0.7.0', 'two_factor_email_token_ttl' );
+
 		/**
 		 * Number of seconds the token is considered valid
 		 * after the generation.
 		 *
 		 * @param integer $token_ttl Token time-to-live in seconds.
 		 * @param integer $user_id User ID.
 		 */
-		return (int) apply_filters( 'two_factor_token_ttl', $token_ttl, $user_id );
+		return (int) apply_filters( 'two_factor_email_token_ttl', $token_ttl, $user_id );
 	}
 
 	/**

readme.txt

@@ -27,7 +27,7 @@ Here is a list of action and filter hooks provided by the plugin:
 - `two_factor_providers` filter overrides the available two-factor providers such as email and time-based one-time passwords. Array values are PHP classnames of the two-factor providers.
 - `two_factor_enabled_providers_for_user` filter overrides the list of two-factor providers enabled for a user. First argument is an array of enabled provider classnames as values, the second argument is the user ID.
 - `two_factor_user_authenticated` action which receives the logged in `WP_User` object as the first argument for determining the logged in user right after the authentication workflow.
-- `two_factor_token_ttl` filter overrides the time interval in seconds that an email token is considered after generation. Accepts the time in seconds as the first argument and the ID of the `WP_User` object being authenticated.
+- `two_factor_email_token_ttl` filter overrides the time interval in seconds that an email token is considered after generation. Accepts the time in seconds as the first argument and the ID of the `WP_User` object being authenticated.
 - `two_factor_email_token_length` filter overrides the default 8 character count for email tokens.
 - `two_factor_backup_code_length` filter overrides the default 8 character count for backup codes. Providers the `WP_User` of the associated user as the second argument.