If it has to be done very quickly, I would do it in a dirty way. Be sure and careful before adopting it, there is back copy of the soapui project.
Close the project from SoapUI
Open the project in a favourite text editor.
Search for (change the value if it is different, when you say 2 seconds, did you put 2000?)
<token>2</token>
Try replacing it with (do not apply replace all, but still this can be quick way)
<token>${#Project#RESPONSE_TIME_SLA}</token>
Save the project.
Now Open the project in SoapUI
Define project level custom property RESPONSE_TIME_SLA and assign the value what ever you want.
This not helps with current change, but also for any changes in the future since it is parameterized.
Hope this helps.
