Some time ago I spent a little bit of time searching in Google to know how many Google queries / searches I could do, using some automatic way like a script. Just to know what is the limit of queries that they expect from one user.
I didn’t find an answer. I found some Google API with a limit of the number of queries, beyond that they were charging some money. But that was for the API, not for the standard searcher.
Then I took the experimental approach: I did about 160000 queries using a Python script, waiting 4 or 5 seconds betweeen each query. They didn’t block the IP, add any captcha or anything at all.
In case that anyone was wondering that: they know now. I haven’t done tests reducing the time between queries.
Why I did that? The results will be soon here. Stay tuned.