First, I would like you to estimate how long it would take you to answer a question using just Google.
Then, I ask you to actually time yourself, and enter the ACTUAL amount of time it took to do the search task.
If you don't think you can DO the task, enter 0 hours as the value. I'll record that as an "impossible to answer" time estimate. Or, if it would just take you too long to answer it, just leave the time estimate blank (just don't put in any numbers). I'll understand that you just don't have the time to actually go and do that task.