diff --git a/jwt/token-verifier.go b/jwt/token-verifier.go
index a10c7f9..a2af4f4 100644
--- a/jwt/token-verifier.go
+++ b/jwt/token-verifier.go
@@ -12,17 +12,19 @@ import (
 
 // TokenVerifier verifies Tokens.
 type TokenVerifier struct {
-	Expiration int
+	Expiration time.Duration
 	secret     string
 }
 
+const DEFAULT_EXPIRATION = time.Hour * time.Duration(72)
+
 func NewTokenVerifier(secret string) (*TokenVerifier, error) {
 	if secret == "" {
 		return nil, ErrEmptySecret
 	}
 
 	return &TokenVerifier{
-		Expiration: 72,
+		Expiration: time.Hour * time.Duration(72),
 		secret:     secret,
 	}, nil
 }
@@ -43,7 +45,7 @@ func (tv *TokenVerifier) CreateToken(user *postgres.User) (string, error) {
 	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
 		"usr":  user.Email,
 		"name": user.Name,
-		"exp":  time.Now().Add(time.Hour * time.Duration(tv.Expiration)).Unix(),
+		"exp":  time.Now().Add(tv.Expiration).Unix(),
 		"id":   user.ID,
 	})