Actual:
When it takes more than 30 seconds to fetch the inputs, run_isolate prints a status message on stdout to warn the user than the setup phase took a significant amount of time.

AI:
- Make the value configurable, where 0 means no output
- Print to stderr instead of stdout

Ref:
See DELAY_BETWEEN_UPDATES_IN_SECS is the hard coded value and fetch_isolated() is the code printing it in https://github.com/luci/luci-py/blob/master/client/isolateserver.py