Lead time in the midlands is down to two to three days but I have turned up at jobs 20mins after they been phone ordered
As for how long it takes I can not tell you without being there, Fastest modem I have install is 2 mins and longest is 2.5 hours
If you never had NTL services then a drop cable needs installing so would say minimum of 1 hour
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As '
patrickp' Said look at that link and follow advice
Even though we told to tell all customers to use the install disk you better of doing it that way and use Ethernet not the USB connection (Even if it means getting a NIC installed)