Many high speed projects across the world lead to large time savings compared to using classic rail: but this won’t happen with HS2!
It is typical for new high speed rail journey times in other countries to take less than half of the time of the conventional rail journey: often as little as a third of the conventional rail journey they replace.
In contrast, the HS2 Economic case, published in February 2011, lists a number of UK journeys and their time savings after completion of HS2 phase 1 and 2. Not a single journey they list is reduced to half the time.
In minutes, the reductions in UK journey times are very small compared to other countries.
For example the HS2 Consultation document (p38) says the Tokyo-Osaka journey reduced from 7 hours to 2 hours 25 minutes, a time saving of 4.5 hours. In contrast the largest time saving in the HS2 Economic case (p10) is one hour, with one example journey (Newcastle to London) being only 15 minutes faster.
All of this at a far higher cost per kilometer to the UK then other countries spend.