diff --git a/internal/captcha/instance.go b/internal/captcha/instance.go
index 934b8c5..ce5d56d 100644
--- a/internal/captcha/instance.go
+++ b/internal/captcha/instance.go
@@ -27,3 +27,7 @@ func Solve(id ID, answer Answer) (bool, error) {
 func IsSolved(id ID) (bool, error) {
 	return captchaDb.IsSolved(id)
 }
+
+func GetExpireInterval() time.Duration {
+	return captchaDb.ExpireInterval
+}