One of the best web hosting companies in Finland has always responded to me within 15 minutes of my email, and I'm not even their customer. I've asked things like if they have safe mode on/off, php/mysql version, quotes for dedicated server... Not very tough questions, but I was still very impressed with the response times.
Basically it also depends on what you asked.
Hardware and performance
what response time should I expect from a host?
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