reducing timeout in bbsim dhcp tests

Change-Id: Ifff7e3ea769a86779cd3e8968eaa95ceb29af179
diff --git a/src/test/cord-api/Tests/WorkflowValidations/BBSIM.robot b/src/test/cord-api/Tests/WorkflowValidations/BBSIM.robot
index 54cc666..c4e16d4 100644
--- a/src/test/cord-api/Tests/WorkflowValidations/BBSIM.robot
+++ b/src/test/cord-api/Tests/WorkflowValidations/BBSIM.robot
@@ -51,7 +51,7 @@
     [Tags]    serviceinstances
     : FOR    ${onu}    IN    @{serial_numbers}
     \    Wait Until Keyword Succeeds    180s    2s    Validate ATT Workflow Driver SI    ENABLED    APPROVED    ${onu}
-    \    Wait Until Keyword Succeeds    1200s    5s    Validate ATT Workflow Driver SI DHCP State    DHCPACK    ${onu}
+    \    Wait Until Keyword Succeeds    300s    5s    Validate ATT Workflow Driver SI DHCP State    DHCPACK    ${onu}
 
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