Moonie, that's not a question I can answer as I don't have access to forum server data. If you were to ask Lori she might be able to arrange some monitoring to see but she could only see it at the US end, not in the UK.
Although broadband is used more in the evening, the busiest time is later than 5 to 6 pm. Ofcom put the peak period as between 8 and 10 pm.