diff --git a/app/workers/quiz_status.rb b/app/workers/quiz_status.rb
index bca6a87..8245c8e 100644
--- a/app/workers/quiz_status.rb
+++ b/app/workers/quiz_status.rb
@@ -18,7 +18,9 @@ class QuizStatus
   end
 
   def can_submit
-    on_summary && candidate.answered_questions.count == candidate.questions.count
+    on_summary &&
+      no_finish_later &&
+      candidate.answered_questions.count == candidate.questions.count
   end
 
   def progress
@@ -28,6 +30,17 @@ class QuizStatus
     (answs / total * 100).round.to_i
   end
 
+  def no_finish_later
+    sql = %(select count(a.id) todos
+           from answers a
+             inner join questions q on q.id = a.question_id
+           where q.input_type = 'live_code'
+             and a.answer like "%later: 'true'%"
+             and a.candidate_id = #{candidate.id})
+    result = ActiveRecord::Base.connection.exec_query(sql).to_hash.first
+    result['todos'].zero?
+  end
+
   def current_question_id
     sql = "select q.id question_id
            from candidates c