Yes this setting is keeping you off from bans if you really use a high number. That means that this is used against each proxy/ip. So a lot proxies will of course get you more search requests done as more search requests can be put out at the same time. But don't change the time to such low values.
I keep it at 60 sec with 200 proxies. Was running 1000 threads But after latest updates it's not hitting the max 1000 threads anymore so I'm adjusting stuff around now to find a new golden middle
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@sven changed a lot of things with this software lately.
I noticed massive improvements in processing, low CPU usage (really low CPU I am happy to say), and slightly lower RAM usage. Just way more efficient.
I haven't fiddled with the custom time lately as I have moved away from ser scraping. So I would listen to @sven.