fix

examcloud-core-oe-student-service/src/main/java/cn/com/qmth/examcloud/core/oe/student/service/impl/ExamControlServiceImpl.java

@@ -1419,7 +1419,7 @@ public class ExamControlServiceImpl implements ExamControlService {
         ExamingHeartbeat examingHeartbeat = redisClient.get(examingHeartbeatKey, ExamingHeartbeat.class);
 
         if (null != examingHeartbeat
-                && examingHeartbeat.getCost() >= examSessionInfo.getExamDuration()) {
+                && (examingHeartbeat.getCost()*1000) >= examSessionInfo.getExamDuration()) {
             throw new StatusException("8002", "考试会话已过期，请重新开考");
         }