diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
index 6dcd1d73b..22ef60aad 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
@@ -34,7 +34,7 @@ check:output=~__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-install-comput
 cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]]; then rnetboot $$CN;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then rpower $$CN boot; fi
 check:rc==0
 
-cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc" ]]; then sleep 120;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then sleep 300;else sleep 180;fi
+cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc" ]]; then sleep 1200;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then sleep 600;else sleep 180;fi
 
 cmd:lsdef -l $$CN | grep status
 check:output!~booted